| 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 | $ 0.10312 | 8.887% | 7 | |
| 1978 | $ 0.12500 | 21.212% | 8.544% | 6 |
| 1979 | $ 0.13750 | 10.000% | 8.500% | 6 |
| 1980 | $ 0.13750 | NO CHANGE | 8.777% | 6 |
| 1981 | $ 0.15000 | 9.091% | 8.767% | 7 |
| 1982 | $ 0.15000 | NO CHANGE | 9.072% | 6 |
| 1983 | $ 0.15937 | 6.250% | 9.171% | 6 |
| 1984 | $ 0.17188 | 7.843% | 9.218% | 7 |
| 1985 | $ 0.17500 | 1.818% | 9.503% | 7 |
| 1986 | $ 0.17500 | NO CHANGE | 9.886% | 6 |
| 1987 | $ 0.17500 | NO CHANGE | 10.301% | 6 |
| 1988 | $ 0.19375 | 10.714% | 10.284% | 6 |
| 1989 | $ 0.20000 | 3.226% | 10.601% | 6 |
| 1990 | $ 0.22500 | 12.500% | 10.516% | 6 |
| 1991 | $ 0.22500 | NO CHANGE | 11.043% | 6 |
| 1992 | $ 0.22500 | NO CHANGE | 11.626% | 6 |
| 1993 | $ 0.22500 | NO CHANGE | 12.274% | 5 |
| 1994 | $ 0.23750 | 5.556% | 12.660% | 5 |
| 1995 | $ 0.25625 | 7.895% | 12.946% | 5 |
| 1996 | $ 0.27500 | 7.317% | 13.308% | 5 |
| 1997 | $ 0.31000 | 12.727% | 13.347% | 5 |
| 1998 | $ 0.34750 | 12.097% | 13.437% | 5 |
| 1999 | $ 0.38000 | 9.353% | 13.757% | 5 |
| 2000 | $ 0.41250 | 8.553% | 14.202% | 5 |
| 2001 | $ 0.45000 | 9.091% | 14.678% | 5 |
| 2002 | $ 0.49000 | 8.889% | 15.274% | 5 |
| 2003 | $ 0.56750 | 15.816% | 15.213% | 5 |
| 2004 | $ 0.70000 | 23.348% | 14.235% | 5 |
| 2005 | $ 0.88000 | 25.714% | 12.683% | 3 |
| 2006 | $ 1.01500 | 15.341% | 12.246% | 3 |
| 2007 | $ 1.17000 | 15.271% | 11.651% | 3 |
| 2008 | $ 1.34500 | 14.957% | 10.839% | 2 |
| 2009 | $ 1.54000 | 14.498% | 9.646% | 1 |
| 2010 | $ 1.70000 | 10.390% | 9.276% | 0 |
| 2011 | $ 1.86500 | 9.706% | 8.847% | 0 |
| 2012 | $ 2.03000 | 8.847% |
| Yield | Price |
| 0.5% | $406.00 |
| 1.0% | $203.00 |
| 1.5% | $135.33 |
| 2.0% | $101.50 |
| 2.5% | $ 81.20 |
| 3.0% | $ 67.67 |
| 3.5% | $ 58.00 |
| 4.0% | $ 50.75 |
| 4.5% | $ 45.11 |
| 5.0% | $ 40.60 |
| 5.5% | $ 36.91 |
| 6.0% | $ 33.83 |
| 6.5% | $ 31.23 |
| 7.0% | $ 29.00 |
| 7.5% | $ 27.07 |
| 8.0% | $ 25.38 |
| 8.5% | $ 23.88 |
| 9.0% | $ 22.56 |
| 9.5% | $ 21.37 |
| 10.0% | $ 20.30 |