MariaDB [phabricator_differential]> SELECT COUNT(DISTINCT authorPHID), MONTH(FROM_UNIXTIME(dateCreated)), YEAR(FROM_UNIXTIME(dateCreated)) FROM differential_revision GROUP BY YEAR(FROM_UNIXTIME(dateCreated)), MONTH(FROM_UNIXTIME(dateCreated));
+----------------------------+-----------------------------------+----------------------------------+
| COUNT(DISTINCT authorPHID) | MONTH(FROM_UNIXTIME(dateCreated)) | YEAR(FROM_UNIXTIME(dateCreated)) |
+----------------------------+-----------------------------------+----------------------------------+
|                          1 |                                 1 |                             2015 |
|                          2 |                                 2 |                             2015 |
|                          3 |                                 3 |                             2015 |
|                         11 |                                 4 |                             2015 |
|                          8 |                                 5 |                             2015 |
|                          9 |                                 6 |                             2015 |
|                         12 |                                 7 |                             2015 |
|                         18 |                                 8 |                             2015 |
|                         20 |                                 9 |                             2015 |
|                         15 |                                10 |                             2015 |
|                         21 |                                11 |                             2015 |
|                         25 |                                12 |                             2015 |
|                         36 |                                 1 |                             2016 |
|                         41 |                                 2 |                             2016 |
|                         55 |                                 3 |                             2016 |
|                         55 |                                 4 |                             2016 |
|                         46 |                                 5 |                             2016 |
|                         61 |                                 6 |                             2016 |
|                         51 |                                 7 |                             2016 |
|                         58 |                                 8 |                             2016 |
|                         62 |                                 9 |                             2016 |
|                         62 |                                10 |                             2016 |
|                         66 |                                11 |                             2016 |
|                         72 |                                12 |                             2016 |
|                         87 |                                 1 |                             2017 |
|                         95 |                                 2 |                             2017 |
|                         91 |                                 3 |                             2017 |
|                         89 |                                 4 |                             2017 |
|                        105 |                                 5 |                             2017 |
|                         95 |                                 6 |                             2017 |
|                        119 |                                 7 |                             2017 |
|                        123 |                                 8 |                             2017 |
|                        125 |                                 9 |                             2017 |
|                        142 |                                10 |                             2017 |
|                        109 |                                11 |                             2017 |
|                        103 |                                12 |                             2017 |
|                        157 |                                 1 |                             2018 |
|                        167 |                                 2 |                             2018 |
|                        182 |                                 3 |                             2018 |
|                        144 |                                 4 |                             2018 |
|                        165 |                                 5 |                             2018 |
|                        140 |                                 6 |                             2018 |
|                        143 |                                 7 |                             2018 |
|                        160 |                                 8 |                             2018 |
|                        154 |                                 9 |                             2018 |
|                        164 |                                10 |                             2018 |
|                        144 |                                11 |                             2018 |
|                        157 |                                12 |                             2018 |
|                        161 |                                 1 |                             2019 |
|                        172 |                                 2 |                             2019 |
|                        155 |                                 3 |                             2019 |
|                        151 |                                 4 |                             2019 |
|                        140 |                                 5 |                             2019 |
|                        128 |                                 6 |                             2019 |
|                        144 |                                 7 |                             2019 |
|                        139 |                                 8 |                             2019 |
|                         46 |                                 9 |                             2019 |
+----------------------------+-----------------------------------+----------------------------------+