| 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 | 0 |
| March | 34 |
| April | 0 |
| May | 0 |
| June | 33 |
| July | 0 |
| August | 0 |
| September | 33 |
| October | 0 |
| November | 0 |
| December | 33 |
| Status | Number |
| Cancelled | 0 |
| Discontinued | 0 |
| Omitted | 0 |
| Year | Dividends paid | Increase from previous year | CAGR to 2012 from | Bumpiness to 2012 from |
| 1980 | $ 0.01250 | 10.975% | 10 | |
| 1981 | $ 0.01344 | 7.512% | 11.088% | 10 |
| 1982 | $ 0.01375 | 2.329% | 11.393% | 10 |
| 1983 | $ 0.01375 | NO CHANGE | 11.808% | 10 |
| 1984 | $ 0.01375 | NO CHANGE | 12.254% | 10 |
| 1985 | $ 0.01375 | NO CHANGE | 12.736% | 9 |
| 1986 | $ 0.01698 | 23.480% | 12.342% | 9 |
| 1987 | $ 0.01375 | DECREASE | 13.822% | 7 |
| 1988 | $ 0.01531 | 11.344% | 13.927% | 7 |
| 1989 | $ 0.01583 | 3.396% | 14.408% | 7 |
| 1990 | $ 0.01771 | 11.843% | 14.526% | 7 |
| 1991 | $ 0.02083 | 17.648% | 14.380% | 7 |
| 1992 | $ 0.02458 | 18.006% | 14.201% | 7 |
| 1993 | $ 0.02687 | 9.324% | 14.464% | 7 |
| 1994 | $ 0.03500 | 30.233% | 13.646% | 7 |
| 1995 | $ 0.03500 | NO CHANGE | 14.505% | 6 |
| 1996 | $ 0.04125 | 17.857% | 14.298% | 6 |
| 1997 | $ 0.04625 | 12.121% | 14.445% | 6 |
| 1998 | $ 0.05250 | 13.514% | 14.512% | 6 |
| 1999 | $ 0.06250 | 19.048% | 14.170% | 6 |
| 2000 | $ 0.07125 | 14.000% | 14.184% | 7 |
| 2001 | $ 0.07500 | 5.263% | 15.032% | 6 |
| 2002 | $ 0.08250 | 10.000% | 15.548% | 6 |
| 2003 | $ 0.09250 | 12.121% | 15.935% | 7 |
| 2004 | $ 0.11250 | 21.622% | 15.243% | 7 |
| 2005 | $ 0.14000 | 24.444% | 13.985% | 6 |
| 2006 | $ 0.17000 | 21.429% | 12.790% | 6 |
| 2007 | $ 0.19000 | 11.765% | 12.996% | 7 |
| 2008 | $ 0.22250 | 17.105% | 11.991% | 7 |
| 2009 | $ 0.23000 | 3.371% | 15.022% | 6 |
| 2010 | $ 0.24750 | 7.609% | 18.918% | 2 |
| 2011 | $ 0.29000 | 17.172% | 20.690% | 0 |
| 2012 | $ 0.35000 | 20.690% |
| Yield | Price |
| 0.5% | $ 70.00 |
| 1.0% | $ 35.00 |
| 1.5% | $ 23.33 |
| 2.0% | $ 17.50 |
| 2.5% | $ 14.00 |
| 3.0% | $ 11.67 |
| 3.5% | $ 10.00 |
| 4.0% | $ 8.75 |
| 4.5% | $ 7.78 |
| 5.0% | $ 7.00 |
| 5.5% | $ 6.36 |
| 6.0% | $ 5.83 |
| 6.5% | $ 5.38 |
| 7.0% | $ 5.00 |
| 7.5% | $ 4.67 |
| 8.0% | $ 4.38 |
| 8.5% | $ 4.12 |
| 9.0% | $ 3.89 |
| 9.5% | $ 3.68 |
| 10.0% | $ 3.50 |