The following comes from Hisashi Nogami, producer of Splatoon...
- ratio between Turf War and Ranked Battle players is roughly fifty-fifty
- new players tend to concentrate on Turf War
- those who have played for long time usually focus on Ranked Battle
- recent update increased point bonuses for Turf War, which perhaps made some people to go back to that mode
- many players during the end of 2015 and start of 2016
- current numbers have dropped off in comparison, but there is still a stable number of players