Ethereum balance shows 0

Hi,

I am mining with 52MH/s hash rate from last 3-4 days. But, balance in my account still shows as 0.

Below 2 processes are running simultaneously:

1) downloading blockchain: build/bin/geth --rpc --rpcaddr "127.0.0.1" --rpcport "8545" console
2) mining: ethminer --farm-recheck 500 -G --no-precompute

Am I doing something wrong?

PS: this is my account number: 2bef01aa682e498d5c9d28da4ff28c9eee6f1608 (http://www.xbalances.com/2bef01aa682e498d5c9d28da4ff28c9eee6f1608)