2011
Q4
Q3
Q2
Q1
13.35
12.95
9.90
9.10
15,199,729
19,000,170
2010
11.17
10.25
10.78
11.05
8.77
8.50
8.08
8.98
16,266,232
17,994,618
2009
9.58
8.55
6.92
6.69
7.03
6.25
4.17
3.65
12,577,723
11,706,856
15,544,709
2008
6.99
9.20
12.50
12.68
3.06
6.11
8.30
10.57
19,164,824
11,810,095
14,975,612
11,435,897