Total size of Windows:
1985 - Windows 1.0 - 712kb
1987 - Windows 2.0 - 1.4mb
1990 - Windows 3.0 - 6mb
1992 - Windows 3.1 - 12mb
1995 - Win 95 - 52mb
1998 - Win 98 - 175mb
2000 - Win ME - 320mb
2001 - Win XP - 661mb
2006 - Vista - 7gb
2009 - Win 7 - 19gb
2012 - Win 8 - 22.9gb
2016 - Win 10 - 23gb