| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 58 |
| Monthly | 0 |
| Irregularly | 1 |
| 'none' | 0 |
Current frequency is quarterly.
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 0 |
| March | 12 |
| April | 2 |
| May | 0 |
| June | 15 |
| July | 0 |
| August | 0 |
| September | 15 |
| October | 0 |
| November | 0 |
| December | 15 |
| Status | Number |
| Cancelled | 0 |
| Discontinued | 0 |
| Omitted | 0 |
| Year | Dividends paid | Increase from previous year | CAGR to 2012 from | Bumpiness to 2012 from |
| 1998 | $ 0.07336 | 18.302% | 11 | |
| 1999 | $ 0.10228 | 39.425% | 16.816% | 9 |
| 2000 | $ 0.10739 | 5.001% | 17.859% | 9 |
| 2001 | $ 0.14116 | 31.444% | 16.695% | 8 |
| 2002 | $ 0.16576 | 17.427% | 16.622% | 9 |
| 2003 | $ 0.22408 | 35.184% | 14.724% | 7 |
| 2004 | $ 0.26107 | 16.507% | 14.503% | 7 |
| 2005 | $ 0.30898 | 18.352% | 13.964% | 7 |
| 2006 | $ 0.32443 | 5.000% | 15.530% | 7 |
| 2007 | $ 0.36415 | 12.245% | 16.199% | 7 |
| 2008 | $ 0.41488 | 13.929% | 16.774% | 8 |
| 2009 | $ 0.46976 | 13.229% | 17.979% | 9 |
| 2010 | $ 0.60944 | 29.733% | 12.508% | 4 |
| 2011 | $ 0.65896 | 8.126% | 17.068% | 0 |
| 2012 | $ 0.77143 | 17.068% |
| Yield | Price |
| 0.5% | $154.29 |
| 1.0% | $ 77.14 |
| 1.5% | $ 51.43 |
| 2.0% | $ 38.57 |
| 2.5% | $ 30.86 |
| 3.0% | $ 25.71 |
| 3.5% | $ 22.04 |
| 4.0% | $ 19.29 |
| 4.5% | $ 17.14 |
| 5.0% | $ 15.43 |
| 5.5% | $ 14.03 |
| 6.0% | $ 12.86 |
| 6.5% | $ 11.87 |
| 7.0% | $ 11.02 |
| 7.5% | $ 10.29 |
| 8.0% | $ 9.64 |
| 8.5% | $ 9.08 |
| 9.0% | $ 8.57 |
| 9.5% | $ 8.12 |
| 10.0% | $ 7.71 |