The PS4 exceeds 5.3 million units sold

Sony has sent us a statement that claims to have sold over 5.3 million worldwide PS4 to February 8 , 2014. Given that went on sale on November 15, 2013 and still has not been released in Japan , it is certain that the number is more than fine.
In fact the company had expected sales of 5 million units before March 31, 2014 , which have exceeded their expectations . The PS4 has sold fast, but how about did their little sisters ?
Keep in mind that the current state of the industry is not the same as twenty years ago (the first PlayStation was released in December 1994) , but the numbers are more than curious . Keep an eye on the data:
PS1

    4 months ( a territory ) - 31 marc 1995-0850000
    10 months - 30 septiembreh 1995-1770000
    16 months - March 31, 1996-4260000
    22 months - September 30, 1996-8070000
    28 months - March 31, 1997 to 13.50 million
PS2

    1 month ( territory ) - March 31, 2000-1410000
    7 months ( a territory ) - September 30, 2000-3520000
    13 months - March 31, 2001-10610000
    19 months - September 30, 2001-19580000
    22 months - December 30, 2001-24990000
PS3

    1 month - 31 december 2006-1700000
    4 months - March 31, 2007-3500000
    7 months - June 30, 2007-4200000
    10 months - September 30, 2007-5500000
    13 months - 31 december 2007-10400000
PS4

    One day - November 16, 2013-1 million
    2 weeks - December 1, 2013-2100000
    1 month - December 28, 2013-4200000
    3 months - February 8, 2014-5300000