I have just gone through all the 10,000 reward blocks (actually was 2881 - 3600, not as above) and counted the number of POS blocks during that period. The number was 250 POS blocks which equates to the total amount of coins being reduced by 2,500,000 for that period. There were 470 POW blocks of 10,000 totalling 4,700,000 RVC.

After block 3600 the total coin supply was currently sitting at 9,255,570 (according to C-CEX) but this includes the premine of 2,500,000 for the IPO, so the total number of POW coins was 6,755,570 after block 3600. This is 2,844,430 short of the amount that it should have been at if POS had not started until after POW.

If we take 250 POS blocks as the average per 720 blocks then the new table would look like this:

Blocks          Reward      Coins
0 - 3600                         6,755,570
3601 - 4320   500            235,000
4321 - 5040   2000           940,000
5041 - 5760   500            235,000
5761 - 6480   2500           1,175,000
6481 - 7200   500            235,000
7201 - 7920   3000           1,410,000
7921 - 8640   500            235,000

So now the estimated total coins is 11,220,570 + the 2,500,000 IPO.