| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 137 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 0 |
| March | 35 |
| April | 0 |
| May | 0 |
| June | 34 |
| July | 0 |
| August | 0 |
| September | 34 |
| October | 0 |
| November | 0 |
| December | 34 |
| Status | Number |
| Cancelled | 0 |
| Discontinued | 0 |
| Omitted | 0 |
| Year | Dividends paid | Increase from previous year | CAGR to 2012 from | Bumpiness to 2012 from |
| 1979 | $ 0.36250 | 7.122% | 6 | |
| 1980 | $ 0.45000 | 24.138% | 6.630% | 5 |
| 1981 | $ 0.48750 | 8.333% | 6.575% | 5 |
| 1982 | $ 0.60000 | 23.077% | 6.065% | 4 |
| 1983 | $ 0.60000 | NO CHANGE | 6.281% | 4 |
| 1984 | $ 0.60000 | NO CHANGE | 6.512% | 4 |
| 1985 | $ 0.60000 | NO CHANGE | 6.761% | 4 |
| 1986 | $ 0.60000 | NO CHANGE | 7.030% | 4 |
| 1987 | $ 0.60000 | NO CHANGE | 7.321% | 4 |
| 1988 | $ 0.63750 | 6.250% | 7.366% | 4 |
| 1989 | $ 0.70000 | 9.804% | 7.262% | 4 |
| 1990 | $ 0.73750 | 5.357% | 7.349% | 4 |
| 1991 | $ 0.81250 | 10.169% | 7.216% | 4 |
| 1992 | $ 0.82500 | 1.538% | 7.508% | 4 |
| 1993 | $ 0.87500 | 6.061% | 7.585% | 4 |
| 1994 | $ 0.92500 | 5.714% | 7.690% | 4 |
| 1995 | $ 0.96250 | 4.054% | 7.908% | 4 |
| 1996 | $ 1.04000 | 8.052% | 7.899% | 4 |
| 1997 | $ 1.14000 | 9.615% | 7.785% | 4 |
| 1998 | $ 1.22000 | 7.018% | 7.841% | 5 |
| 1999 | $ 1.24000 | 1.639% | 8.333% | 4 |
| 2000 | $ 1.30000 | 4.839% | 8.629% | 4 |
| 2001 | $ 1.32500 | 1.923% | 9.260% | 4 |
| 2002 | $ 1.40000 | 5.660% | 9.627% | 4 |
| 2003 | $ 1.43000 | 2.143% | 10.492% | 3 |
| 2004 | $ 1.53000 | 6.993% | 10.937% | 3 |
| 2005 | $ 1.75000 | 14.379% | 10.454% | 3 |
| 2006 | $ 2.01000 | 14.857% | 9.737% | 3 |
| 2007 | $ 2.26000 | 12.438% | 9.204% | 3 |
| 2008 | $ 2.53000 | 11.947% | 8.529% | 3 |
| 2009 | $ 2.66000 | 5.138% | 9.684% | 3 |
| 2010 | $ 2.84000 | 6.767% | 11.172% | 2 |
| 2011 | $ 3.09000 | 8.803% | 13.592% | 0 |
| 2012 | $ 3.51000 | 13.592% |
| Yield | Price |
| 0.5% | $702.00 |
| 1.0% | $351.00 |
| 1.5% | $234.00 |
| 2.0% | $175.50 |
| 2.5% | $140.40 |
| 3.0% | $117.00 |
| 3.5% | $100.29 |
| 4.0% | $ 87.75 |
| 4.5% | $ 78.00 |
| 5.0% | $ 70.20 |
| 5.5% | $ 63.82 |
| 6.0% | $ 58.50 |
| 6.5% | $ 54.00 |
| 7.0% | $ 50.14 |
| 7.5% | $ 46.80 |
| 8.0% | $ 43.88 |
| 8.5% | $ 41.29 |
| 9.0% | $ 39.00 |
| 9.5% | $ 36.95 |
| 10.0% | $ 35.10 |