This is the total amount of AMPs in existence. The AMPs investors/traders hold are included in that number. Some coins (held in wallets by Synereo) which are not in circulation yet will come onto the market within the next couple of years. For example to attract users to the platform and to do another fundraising campaign to perfect the platform. These coins will come slowly.
The 949,291,062.75 you are talking about started at 2 billion. The reason that it is less than a billion now is that Synereo burned a lot of tokens. The first time they did this was in the ICO in 2015, that time they burned 319 million AMPs. The second time (in september this year) they burned 731,108,937 AMPs.
But it even gets better.... Synereo will burn coins again for the third time, they said before the recent fundraising campaign that they would burn unsold tokens. They reserved about 45 million coins and there are now 27,680,033 coins left in that wallet. So we can expect this number so be burned very soon

The total AMPs in existence will get smaller once again. 921,611,030 coins will be left after the burning event takes place.
The coming burning event will be a bullish event for the market, that's for sure. I won't sell my AMPs, to many good stuff coming!