| Year | Low | High | Average | Close | Year Change | Average volumes |
|---|---|---|---|---|---|---|
| 1990(1) | 0.79 | 1.46 | 1.09 | 1.02 | 7.24%(2) | 989,578 |
| 1991 | 0.99 | 2.75 | 1.82 | 2.75 | 169.93% | 390,719 |
| 1992 | 2.25 | 3.28 | 2.85 | 2.51 |
-8.64% |
313,051 |
| 1993 |
2.03 |
2.95 | 2.37 | 2.93 | 16.42% | 231,107 |
| 1994 |
2.79 |
3.63 | 3.28 | 3.41 | 16.67% | 189,325 |
| 1995 |
3.18 |
5.95 | 4.18 | 5.85 | 71.43% | 417,048 |
| 1996 |
5.21 |
8.10 | 7.03 | 5.21 | -10.90% | 348,201 |
| 1997 |
5.13 |
6.99 | 6.09 | 6.25 | 19.90% | 427,059 |
| 1998 |
3.88 |
9.49 | 6.96 | 6.00 | -4.00% | 342,659 |
| 1999 |
5.00 |
10.31 | 7.61 | 8.78 | 46.35% | 354,464 |
| 2000 |
7.97 |
17.00 | 12.95 | 13.75 | 56.58% | 222,136 |
| 2001 |
12.15 |
17.99 | 15.28 | 16.48 | 19.85% | 248,020 |
| 2002 |
11.82 |
20.85 | 16.18 | 13.65 | -17.17% | 273,378 |
| 2003 |
10.23 |
18.15 | 13.88 | 17.40 | 27.47% | 156,275 |
| 2004 |
15.18 |
20.39 | 17.34 | 18.64 | 7.13% |
80,921 |
| 2005 |
19.69 |
25.83 | 22.41 | 25.31 | 35.78% | 70,244 |
| 2006 |
24.36 |
31.39 | 28.30 | 30.67 | 21.18% | 76,514 |
| 2007 |
29.70 |
38.64 | 33.93 | 31.49 | 2.67% | 125,672 |
| 2008 |
15.98 |
30.92 | 24.23 | 18.12 | -42.46% | 251,319 |
| 2009 |
11.88 |
26.91 | 20.99 | 25.68 | 41.72% | 145,041 |
Note:
(1) These figures have been retroactively adjusted to reflect the five-for-one stock split which was effective April 16, 1998, and the two-for-one stock split which was effective June 26, 2000.
(2) From IPO (January 24, 1990).

| Year | Low | High | Average | Close | Year change | Average volumes |
|---|---|---|---|---|---|---|
| 2000 | 15.24 | 17.62 | 16.53 | 15.36 | -16,99%(1) | 211,328 |
| 2001 |
13.41 |
20.62 | 17.10 | 18.43 | 20.02% | 117,744 |
| 2002 |
11.75 |
22.95 | 17.38 | 12.58 | -31.76% | 204,110 |
| 2003 |
9.25 |
14.82 | 12.23 | 13.70 | 8.94% | 458,682 |
| 2004 | 12.43 | 15.51 | 13.91 | 15.00 | 9.45% | 671,783 |
| 2005 |
15.11 |
21.94 | 18.11 | 21.43 | 42.91% | 789,552 |
| 2006 |
19.30 |
24.46 | 22.51 | 23.28 | 8.63% | 869,788 |
| 2007 |
22.72 |
28.79 | 24.98 | 21.75 | -6.57% | 1,306,403 |
| 2008 |
12.67 |
21.15 | 16.49 | 12.67 | -41.75% | 2,058,049 |
| 2009 |
9.61 |
18.25 | 14.91 | 18.05 | 42.06% | 1,110,437 |
Note:
(1) From IPO (December 4, 2000).
