| 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 | $ 0.18333 | 6.037% | 47 | |
| 1981 | $ 0.20000 | 9.092% | 5.939% | 48 |
| 1982 | $ 0.20000 | NO CHANGE | 6.143% | 49 |
| 1983 | $ 0.20000 | NO CHANGE | 6.362% | 49 |
| 1984 | $ 0.20833 | 4.167% | 6.441% | 50 |
| 1985 | $ 0.23333 | 12.000% | 6.241% | 51 |
| 1986 | $ 0.23333 | NO CHANGE | 6.488% | 52 |
| 1987 | $ 0.23333 | NO CHANGE | 6.756% | 53 |
| 1988 | $ 0.23333 | NO CHANGE | 7.048% | 54 |
| 1989 | $ 0.23333 | NO CHANGE | 7.365% | 55 |
| 1990 | $ 0.23333 | NO CHANGE | 7.712% | 56 |
| 1991 | $ 0.23333 | NO CHANGE | 8.094% | 57 |
| 1992 | $ 0.25333 | 8.571% | 8.070% | 59 |
| 1993 | $ 0.26000 | 2.632% | 8.364% | 60 |
| 1994 | $ 0.28000 | 7.693% | 8.402% | 62 |
| 1995 | $ 0.36000 | 28.571% | 7.319% | 64 |
| 1996 | $ 0.47000 | 30.555% | 6.013% | 66 |
| 1997 | $ 0.54000 | 14.894% | 5.446% | 68 |
| 1998 | $ 0.60000 | 11.111% | 5.052% | 71 |
| 1999 | $ 0.60000 | NO CHANGE | 5.451% | 73 |
| 2000 | $ 0.60000 | NO CHANGE | 5.919% | 76 |
| 2001 | $ 0.68000 | 13.333% | 5.269% | 80 |
| 2002 | $ 0.42000 | DECREASE | 11.034% | 80 |
| 2003 | $ 0.04000 | DECREASE | 45.873% | 64 |
| 2004 | $ 0.08000 | 100.000% | 40.230% | 65 |
| 2005 | $ 0.25000 | 212.500% | 25.062% | 22 |
| 2006 | $ 0.34500 | 38.000% | 23.027% | 23 |
| 2007 | $ 0.39000 | 13.043% | 25.127% | 25 |
| 2008 | $ 0.43000 | 10.256% | 29.148% | 26 |
| 2009 | $ 0.44000 | 2.326% | 39.569% | 22 |
| 2010 | $ 0.48500 | 10.227% | 57.051% | 3 |
| 2011 | $ 0.77500 | 59.794% | 54.355% | 0 |
| 2012 | $ 1.19625 | 54.355% |
| Yield | Price |
| 0.5% | $239.25 |
| 1.0% | $119.62 |
| 1.5% | $ 79.75 |
| 2.0% | $ 59.81 |
| 2.5% | $ 47.85 |
| 3.0% | $ 39.88 |
| 3.5% | $ 34.18 |
| 4.0% | $ 29.91 |
| 4.5% | $ 26.58 |
| 5.0% | $ 23.93 |
| 5.5% | $ 21.75 |
| 6.0% | $ 19.94 |
| 6.5% | $ 18.40 |
| 7.0% | $ 17.09 |
| 7.5% | $ 15.95 |
| 8.0% | $ 14.95 |
| 8.5% | $ 14.07 |
| 9.0% | $ 13.29 |
| 9.5% | $ 12.59 |
| 10.0% | $ 11.96 |