are we all mining for others ??

{
"height" : 2284,
"bestblock" : "5985761e09c43d6692e5125dc89779d8a746778106ea0d5ed090027b1a8909d0",
"transactions" : 2120,
"txouts" : 2172,
"bytes_serialized" : 148284,
"hash_serialized" : "c9c648d7272b2c387c01e0bdab2fc9985fd3f72afdcf6625742cb21b2c65cf98",
"total_amount" : 71024.99999744
}
How is this even possible?
This mean, for the first 576 blocks no reward. then there was essentially 1/2 of 50 per block for the next 576 blocks.
So total coins right now: 14400 + 56600 = 71000
Ohhh i get it now. that's the total amount of coins in existence, not the total amount of transfer in that block.