People's Bank of China
The estimate I had seen via Reuters was for a rate of 7.0306. Pretty good!
The uncertainty each day stems from the PBOC's 'countercyclical factor'. No one knows what that is. Which is just fine with the PBOC ;-)
PBOC injects 80bn yuan in 7 day RRs today.
For the week the Bank has added in net 300bn yen through open market operations.