
| DATE | OPEN | HIGH | LOW | CLOSE | VOLUME | 
|---|---|---|---|---|---|
December 2011     | $11.48     | $12.28     | $11.34     | $12.16     | 6,306,532,400     | 
November 2011     | $11.93     | $12.25     | $10.91     | $11.47     | 8,963,701,600     | 
October 2011     | $11.42     | $12.81     | $10.63     | $12.15     | 13,141,427,600     | 
September 2011     | $11.58     | $12.69     | $11.00     | $11.45     | 11,977,448,000     | 
August 2011     | $11.94     | $11.99     | $10.60     | $11.55     | 16,142,599,200     | 
July 2011     | $10.09     | $12.14     | $10.03     | $11.72     | 10,653,946,800     | 
June 2011     | $10.47     | $10.57     | $9.32     | $10.08     | 9,263,850,400     | 
May 2011     | $10.50     | $10.56     | $9.89     | $10.44     | 6,912,060,400     | 
April 2011     | $10.54     | $10.66     | $9.61     | $10.51     | 9,253,829,200     | 
March 2011     | $10.67     | $10.86     | $9.79     | $10.46     | 11,306,458,800     | 
February 2011     | $10.25     | $10.95     | $10.14     | $10.60     | 9,295,949,600     | 
January 2011     | $9.78     | $10.47     | $9.75     | $10.19     | 10,841,535,600     | 
December 2010     | $9.46     | $9.81     | $9.45     | $9.68     | 6,973,234,800     | 
November 2010     | $9.07     | $9.65     | $8.94     | $9.34     | 9,508,086,000     | 
October 2010     | $8.59     | $9.58     | $8.34     | $9.04     | 12,234,577,600     | 
September 2010     | $7.43     | $8.85     | $7.39     | $8.52     | 11,849,919,200     | 
August 2010     | $7.82     | $7.93     | $7.07     | $7.30     | 9,589,120,800     | 
July 2010     | $7.63     | $7.99     | $7.19     | $7.72     | 15,669,704,400     | 
June 2010     | $7.80     | $8.38     | $7.27     | $7.55     | 16,651,252,800     | 
May 2010     | $7.92     | $8.04     | $5.98     | $7.71     | 18,082,654,800     | 
April 2010     | $7.13     | $8.18     | $6.99     | $7.84     | 12,367,129,600     | 
March 2010     | $6.18     | $7.13     | $6.17     | $7.05     | 12,154,172,800     | 
February 2010     | $5.78     | $6.16     | $5.73     | $6.14     | 10,776,080,000     | 
January 2010     | $6.41     | $6.47     | $5.71     | $5.77     | 15,168,994,400     | 
December 2009     | $6.07     | $6.42     | $5.66     | $6.33     | 11,393,958,800     |