Don't forget that 2002 was the year that ps2 was 199% from may and onwards,hence the huge boost in June 2002.As for PS3,the first half of 2008 was the year that it got many major games(DMC4,GTA4,MGS4,GT5 prologue) and had a price cut boost from the end of 2007.If PS4 goes 299$ in 2015,we will see a huge boost for it,as well.PS4 will most likely sell anything between 5-7mln this year,depending on price cut or not.