| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 145 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 0 |
| March | 37 |
| April | 0 |
| May | 0 |
| June | 36 |
| July | 0 |
| August | 0 |
| September | 36 |
| October | 0 |
| November | 0 |
| December | 36 |
| Status | Number |
| Cancelled | 0 |
| Discontinued | 0 |
| Omitted | 0 |
| Year | Dividends paid | Increase from previous year | CAGR to 2012 from | Bumpiness to 2012 from |
| 1977 | $ 0.02604 | 11.869% | 6 | |
| 1978 | $ 0.03021 | 16.001% | 11.750% | 6 |
| 1979 | $ 0.03437 | 13.787% | 11.689% | 6 |
| 1980 | $ 0.03854 | 12.125% | 11.675% | 7 |
| 1981 | $ 0.04271 | 10.812% | 11.703% | 7 |
| 1982 | $ 0.04687 | 9.752% | 11.769% | 7 |
| 1983 | $ 0.05104 | 8.892% | 11.870% | 7 |
| 1984 | $ 0.05604 | 9.798% | 11.944% | 7 |
| 1985 | $ 0.06333 | 13.010% | 11.905% | 7 |
| 1986 | $ 0.07000 | 10.525% | 11.958% | 7 |
| 1987 | $ 0.07667 | 9.526% | 12.057% | 7 |
| 1988 | $ 0.08500 | 10.868% | 12.107% | 7 |
| 1989 | $ 0.09333 | 9.802% | 12.208% | 8 |
| 1990 | $ 0.11000 | 17.859% | 11.958% | 8 |
| 1991 | $ 0.12000 | 9.091% | 12.096% | 8 |
| 1992 | $ 0.12667 | 5.557% | 12.433% | 8 |
| 1993 | $ 0.13333 | 5.261% | 12.824% | 8 |
| 1994 | $ 0.14000 | 5.001% | 13.275% | 8 |
| 1995 | $ 0.14500 | 3.572% | 13.874% | 8 |
| 1996 | $ 0.15333 | 5.747% | 14.402% | 8 |
| 1997 | $ 0.16500 | 7.608% | 14.870% | 8 |
| 1998 | $ 0.18000 | 9.091% | 15.294% | 8 |
| 1999 | $ 0.20000 | 11.111% | 15.622% | 8 |
| 2000 | $ 0.21000 | 5.000% | 16.555% | 8 |
| 2001 | $ 0.22000 | 4.762% | 17.690% | 7 |
| 2002 | $ 0.24000 | 9.091% | 18.587% | 7 |
| 2003 | $ 0.26000 | 8.333% | 19.784% | 6 |
| 2004 | $ 0.30000 | 15.385% | 20.346% | 6 |
| 2005 | $ 0.36000 | 20.000% | 20.395% | 7 |
| 2006 | $ 0.44000 | 22.222% | 20.094% | 7 |
| 2007 | $ 0.52000 | 18.182% | 20.480% | 8 |
| 2008 | $ 0.60000 | 15.385% | 21.788% | 8 |
| 2009 | $ 0.66000 | 10.000% | 25.992% | 5 |
| 2010 | $ 0.84000 | 27.273% | 25.357% | 5 |
| 2011 | $ 1.10000 | 30.952% | 20.000% | 0 |
| 2012 | $ 1.32000 | 20.000% |
| Yield | Price |
| 0.5% | $264.00 |
| 1.0% | $132.00 |
| 1.5% | $ 88.00 |
| 2.0% | $ 66.00 |
| 2.5% | $ 52.80 |
| 3.0% | $ 44.00 |
| 3.5% | $ 37.71 |
| 4.0% | $ 33.00 |
| 4.5% | $ 29.33 |
| 5.0% | $ 26.40 |
| 5.5% | $ 24.00 |
| 6.0% | $ 22.00 |
| 6.5% | $ 20.31 |
| 7.0% | $ 18.86 |
| 7.5% | $ 17.60 |
| 8.0% | $ 16.50 |
| 8.5% | $ 15.53 |
| 9.0% | $ 14.67 |
| 9.5% | $ 13.89 |
| 10.0% | $ 13.20 |