| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 133 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 34 |
| March | 0 |
| April | 0 |
| May | 33 |
| June | 0 |
| July | 0 |
| August | 33 |
| September | 0 |
| October | 0 |
| November | 33 |
| December | 0 |
| Status | Number |
| Cancelled | 0 |
| Discontinued | 0 |
| Omitted | 0 |
| Year | Dividends paid | Increase from previous year | CAGR to 2012 from | Bumpiness to 2012 from |
| 1980 | $ 0.19000 | 3.659% | 8 | |
| 1981 | $ 0.20000 | 5.263% | 3.607% | 8 |
| 1982 | $ 0.24000 | 20.000% | 3.101% | 7 |
| 1983 | $ 0.18000 | DECREASE | 4.239% | 5 |
| 1984 | $ 0.18500 | 2.778% | 4.292% | 5 |
| 1985 | $ 0.20500 | 10.811% | 4.058% | 5 |
| 1986 | $ 0.22750 | 10.976% | 3.800% | 5 |
| 1987 | $ 0.25000 | 9.890% | 3.564% | 5 |
| 1988 | $ 0.27000 | 8.000% | 3.383% | 5 |
| 1989 | $ 0.29000 | 7.407% | 3.212% | 5 |
| 1990 | $ 0.29000 | NO CHANGE | 3.360% | 5 |
| 1991 | $ 0.29000 | NO CHANGE | 3.523% | 5 |
| 1992 | $ 0.29000 | NO CHANGE | 3.702% | 5 |
| 1993 | $ 0.29000 | NO CHANGE | 3.901% | 5 |
| 1994 | $ 0.29500 | 1.724% | 4.023% | 6 |
| 1995 | $ 0.30000 | 1.695% | 4.162% | 6 |
| 1996 | $ 0.31000 | 3.333% | 4.214% | 6 |
| 1997 | $ 0.34000 | 9.677% | 3.859% | 6 |
| 1998 | $ 0.34000 | NO CHANGE | 4.140% | 6 |
| 1999 | $ 0.34000 | NO CHANGE | 4.466% | 6 |
| 2000 | $ 0.34000 | NO CHANGE | 4.847% | 6 |
| 2001 | $ 0.34000 | NO CHANGE | 5.299% | 6 |
| 2002 | $ 0.34000 | NO CHANGE | 5.844% | 6 |
| 2003 | $ 0.34000 | NO CHANGE | 6.514% | 6 |
| 2004 | $ 0.34000 | NO CHANGE | 7.358% | 6 |
| 2005 | $ 0.36000 | 5.882% | 7.570% | 7 |
| 2006 | $ 0.39000 | 8.333% | 7.444% | 7 |
| 2007 | $ 0.43500 | 11.538% | 6.643% | 8 |
| 2008 | $ 0.48000 | 10.345% | 5.737% | 8 |
| 2009 | $ 0.48000 | NO CHANGE | 7.722% | 9 |
| 2010 | $ 0.48000 | NO CHANGE | 11.803% | 8 |
| 2011 | $ 0.50000 | 4.167% | 20.000% | 0 |
| 2012 | $ 0.60000 | 20.000% |
| Yield | Price |
| 0.5% | $120.00 |
| 1.0% | $ 60.00 |
| 1.5% | $ 40.00 |
| 2.0% | $ 30.00 |
| 2.5% | $ 24.00 |
| 3.0% | $ 20.00 |
| 3.5% | $ 17.14 |
| 4.0% | $ 15.00 |
| 4.5% | $ 13.33 |
| 5.0% | $ 12.00 |
| 5.5% | $ 10.91 |
| 6.0% | $ 10.00 |
| 6.5% | $ 9.23 |
| 7.0% | $ 8.57 |
| 7.5% | $ 8.00 |
| 8.0% | $ 7.50 |
| 8.5% | $ 7.06 |
| 9.0% | $ 6.67 |
| 9.5% | $ 6.32 |
| 10.0% | $ 6.00 |