| 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 | 37 |
| March | 0 |
| April | 0 |
| May | 36 |
| June | 0 |
| July | 0 |
| August | 36 |
| September | 0 |
| October | 0 |
| November | 36 |
| December | 0 |
| Status | Number |
| Cancelled | 0 |
| Discontinued | 0 |
| Omitted | 0 |
| Year | Dividends paid | Increase from previous year | CAGR to 2012 from | Bumpiness to 2012 from |
| 1977 | $ 0.08125 | 9.899% | 4 | |
| 1978 | $ 0.09063 | 11.542% | 9.851% | 4 |
| 1979 | $ 0.10313 | 13.794% | 9.734% | 4 |
| 1980 | $ 0.11250 | 9.089% | 9.754% | 4 |
| 1981 | $ 0.12187 | 8.332% | 9.800% | 4 |
| 1982 | $ 0.13125 | 7.695% | 9.871% | 4 |
| 1983 | $ 0.13125 | DECREASE | 10.228% | 4 |
| 1984 | $ 0.15625 | 19.048% | 9.926% | 4 |
| 1985 | $ 0.16250 | 4.000% | 10.151% | 4 |
| 1986 | $ 0.16719 | 2.886% | 10.441% | 3 |
| 1987 | $ 0.16875 | 0.935% | 10.839% | 3 |
| 1988 | $ 0.17500 | 3.702% | 11.147% | 2 |
| 1989 | $ 0.20625 | 17.857% | 10.864% | 2 |
| 1990 | $ 0.23125 | 12.121% | 10.807% | 2 |
| 1991 | $ 0.25000 | 8.108% | 10.938% | 2 |
| 1992 | $ 0.26875 | 7.500% | 11.112% | 2 |
| 1993 | $ 0.29250 | 8.837% | 11.233% | 2 |
| 1994 | $ 0.33000 | 12.821% | 11.146% | 2 |
| 1995 | $ 0.37500 | 13.636% | 11.001% | 2 |
| 1996 | $ 0.42500 | 13.333% | 10.857% | 2 |
| 1997 | $ 0.47750 | 12.353% | 10.758% | 2 |
| 1998 | $ 0.53750 | 12.565% | 10.630% | 2 |
| 1999 | $ 0.60500 | 12.558% | 10.483% | 2 |
| 2000 | $ 0.67000 | 10.744% | 10.461% | 2 |
| 2001 | $ 0.73000 | 8.955% | 10.599% | 2 |
| 2002 | $ 0.79000 | 8.219% | 10.840% | 2 |
| 2003 | $ 0.86500 | 9.494% | 10.991% | 2 |
| 2004 | $ 0.97750 | 13.006% | 10.741% | 2 |
| 2005 | $ 1.09000 | 11.509% | 10.632% | 2 |
| 2006 | $ 1.21000 | 11.009% | 10.569% | 2 |
| 2007 | $ 1.36000 | 12.397% | 10.207% | 2 |
| 2008 | $ 1.55000 | 13.971% | 9.286% | 1 |
| 2009 | $ 1.72000 | 10.968% | 8.731% | 1 |
| 2010 | $ 1.88540 | 9.616% | 8.291% | 1 |
| 2011 | $ 2.05680 | 9.091% | 7.497% | 0 |
| 2012 | $ 2.21100 | 7.497% |
| Yield | Price |
| 0.5% | $442.20 |
| 1.0% | $221.10 |
| 1.5% | $147.40 |
| 2.0% | $110.55 |
| 2.5% | $ 88.44 |
| 3.0% | $ 73.70 |
| 3.5% | $ 63.17 |
| 4.0% | $ 55.28 |
| 4.5% | $ 49.13 |
| 5.0% | $ 44.22 |
| 5.5% | $ 40.20 |
| 6.0% | $ 36.85 |
| 6.5% | $ 34.02 |
| 7.0% | $ 31.59 |
| 7.5% | $ 29.48 |
| 8.0% | $ 27.64 |
| 8.5% | $ 26.01 |
| 9.0% | $ 24.57 |
| 9.5% | $ 23.27 |
| 10.0% | $ 22.11 |