Taken from a user on gamatsu.
In comparison with PS3, full year tracking from MC:
2007
PS3 - 1.184.118
2014
PS4 - 970.667
2008
PS3 - 980.797
2015
PS4 - 1.330.410
2009
PS3 - 1.764.531 (peak year)
2016
PS4 - 1.799.586
Jup definitely a PlayStation console decline, ow wait......