After the halving the subsidy is 3.125 BTC per block. With a targeted block time of 10 minutes, theres 144 blocks per day.

3.125 x 144 x 100,000,000 satoshis per block is 45 billion sats per day. Assuming a population of roughly 8 billion people on the planet, that works out to 5.625 sats per person per day