| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 132 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 0 |
| March | 33 |
| 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 | $ 0.75000 | 0.640% | 19 | |
| 1981 | $ 0.85000 | 13.333% | 0.256% | 19 |
| 1982 | $ 0.75000 | DECREASE | 0.683% | 20 |
| 1983 | $ 0.45000 | DECREASE | 2.497% | 18 |
| 1984 | $ 0.45000 | NO CHANGE | 2.587% | 18 |
| 1985 | $ 0.45000 | NO CHANGE | 2.684% | 19 |
| 1986 | $ 0.25000 | DECREASE | 5.139% | 16 |
| 1987 | $ 0.25000 | NO CHANGE | 5.350% | 17 |
| 1988 | $ 0.35000 | 40.000% | 4.109% | 16 |
| 1989 | $ 0.46000 | 31.429% | 3.060% | 15 |
| 1990 | $ 0.49000 | 6.522% | 2.905% | 15 |
| 1991 | $ 0.50000 | 2.041% | 2.946% | 16 |
| 1992 | $ 0.50000 | NO CHANGE | 3.096% | 16 |
| 1993 | $ 0.50000 | NO CHANGE | 3.261% | 16 |
| 1994 | $ 0.50000 | NO CHANGE | 3.446% | 17 |
| 1995 | $ 0.55500 | 11.000% | 3.018% | 17 |
| 1996 | $ 0.60000 | 8.108% | 2.708% | 18 |
| 1997 | $ 0.66000 | 10.000% | 2.239% | 18 |
| 1998 | $ 0.72000 | 9.091% | 1.766% | 19 |
| 1999 | $ 0.72000 | NO CHANGE | 1.903% | 19 |
| 2000 | $ 0.72000 | NO CHANGE | 2.064% | 20 |
| 2001 | $ 0.67000 | DECREASE | 2.925% | 21 |
| 2002 | $ 0.52000 | DECREASE | 5.871% | 20 |
| 2003 | $ 0.52000 | NO CHANGE | 6.545% | 21 |
| 2004 | $ 0.52000 | NO CHANGE | 7.392% | 22 |
| 2005 | $ 0.60000 | 15.385% | 6.297% | 23 |
| 2006 | $ 0.62000 | 3.333% | 6.799% | 25 |
| 2007 | $ 0.66000 | 6.452% | 6.868% | 27 |
| 2008 | $ 0.70000 | 6.061% | 7.071% | 30 |
| 2009 | $ 0.45000 | DECREASE | 26.919% | 14 |
| 2010 | $ 0.53000 | 17.778% | 31.752% | 15 |
| 2011 | $ 0.78000 | 47.170% | 17.949% | 0 |
| 2012 | $ 0.92000 | 17.949% |
| Yield | Price |
| 0.5% | $184.00 |
| 1.0% | $ 92.00 |
| 1.5% | $ 61.33 |
| 2.0% | $ 46.00 |
| 2.5% | $ 36.80 |
| 3.0% | $ 30.67 |
| 3.5% | $ 26.29 |
| 4.0% | $ 23.00 |
| 4.5% | $ 20.44 |
| 5.0% | $ 18.40 |
| 5.5% | $ 16.73 |
| 6.0% | $ 15.33 |
| 6.5% | $ 14.15 |
| 7.0% | $ 13.14 |
| 7.5% | $ 12.27 |
| 8.0% | $ 11.50 |
| 8.5% | $ 10.82 |
| 9.0% | $ 10.22 |
| 9.5% | $ 9.68 |
| 10.0% | $ 9.20 |