From the 9th-15th march there was approx 5000 servers online (EA had new servers on hold) then servers increased gradually up to a peak of 8058 as of yesterday.
Interestingly we can see total number of concurrent players decreased yesterday, probably due to the appalling server issues:
Date Players Servers
22.03.2010 51,632 8,058
21.03.2010 68,863 8,087
20.03.2010 66,952 8,031
19.03.2010 68,029 7,942
18.03.2010 68,615 7,588
17.03.2010 67,232 6,541
16.03.2010 67,293 6,169
15.03.2010 74,045 5,149
14.03.2010 74,077 5,112
13.03.2010 72,592 5,064
12.03.2010 72,447 5,034
11.03.2010 71,581 5,074
10.03.2010 64,342 5,084