PlayStation+Ninty+Xbox shipment history since 1995, UPDATED May 2015.

Intrinsic said:

 

PlayStation:

4 months (one territory) – March 31st, 1995 – 0.85 million
10 months – September 30th, 1995 – 1.77 million
16 months – March 31st, 1996 – 4.26 million
22 months – September 30th, 1996 – 8.07 million
28 months – March 31st, 1997 – 13.50 million

PS2:

1 month (one territory) – March 31st, 2000 – 1.41 million
7 months (one territory) – September 30th, 2000 – 3.52 million
13 months (all territories) – March 31st, 2001 – 10.61 million
19 months – September 30th, 2001 – 19.58 million
22 months – December 30th, 2001 – 24.99 million

PS3:

1 month – December 31st, 2006 – 1.7 million
4 months – March 31st, 2007 – 3.5 million
7 months – June 30th, 2007 – 4.2 million
10 months – September 30th, 2007 – 5.5 million
13 months – December 31st, 2007 – 10.4 million

PS4:

1 day – November 16th, 2013 – 1 million
2 weeks – December 1st, 2013 – 2.1 million
1 month – December 28th, 2013 – 4.2 million
3 months – February 8th, 2014 – 5.3 million

7 months - ~ 8 million sold.

Aha!  I found it!

http://www.neogaf.com/forum/showthread.php?p=101260277#post101260277

Posted by "Aquamarine", the same person who did those Nintendo charts.  Who is this Aquamarine?  Are they an industry insider or something?

Sorry if I'm straying too far from the topic here.  I'm just trying to find out if these kinds of figures (specifically generations five and six) are publicly available anywhere.