| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 103 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 25 |
| March | 0 |
| April | 0 |
| May | 26 |
| June | 0 |
| July | 0 |
| August | 26 |
| September | 0 |
| October | 0 |
| November | 26 |
| 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 |
| 1987 | $ 0.82500 | 6.675% | 8 | |
| 1988 | $ 1.12500 | 36.364% | 5.589% | 5 |
| 1989 | $ 1.22500 | 8.889% | 5.448% | 5 |
| 1990 | $ 1.30000 | 6.122% | 5.418% | 5 |
| 1991 | $ 1.30000 | NO CHANGE | 5.683% | 5 |
| 1992 | $ 1.30000 | NO CHANGE | 5.975% | 5 |
| 1993 | $ 1.30000 | NO CHANGE | 6.300% | 5 |
| 1994 | $ 1.40000 | 7.692% | 6.223% | 5 |
| 1995 | $ 1.40000 | NO CHANGE | 6.601% | 5 |
| 1996 | $ 1.50000 | 7.143% | 6.567% | 5 |
| 1997 | $ 1.71500 | 14.333% | 6.068% | 5 |
| 1998 | $ 2.10000 | 22.449% | 4.986% | 2 |
| 1999 | $ 2.17500 | 3.571% | 5.095% | 2 |
| 2000 | $ 2.40000 | 10.345% | 4.669% | 2 |
| 2001 | $ 2.45000 | 2.083% | 4.908% | 2 |
| 2002 | $ 2.50000 | 2.041% | 5.199% | 2 |
| 2003 | $ 2.53750 | 1.500% | 5.618% | 1 |
| 2004 | $ 2.63750 | 3.941% | 5.830% | 1 |
| 2005 | $ 2.82500 | 7.109% | 5.648% | 1 |
| 2006 | $ 3.02500 | 7.080% | 5.411% | 1 |
| 2007 | $ 3.22500 | 6.612% | 5.173% | 1 |
| 2008 | $ 3.42500 | 6.202% | 4.917% | 1 |
| 2009 | $ 3.62500 | 5.839% | 4.612% | 1 |
| 2010 | $ 3.82500 | 5.517% | 4.162% | 1 |
| 2011 | $ 4.02500 | 5.229% | 3.106% | 0 |
| 2012 | $ 4.15000 | 3.106% |
| Yield | Price |
| 0.5% | $830.00 |
| 1.0% | $415.00 |
| 1.5% | $276.67 |
| 2.0% | $207.50 |
| 2.5% | $166.00 |
| 3.0% | $138.33 |
| 3.5% | $118.57 |
| 4.0% | $103.75 |
| 4.5% | $ 92.22 |
| 5.0% | $ 83.00 |
| 5.5% | $ 75.45 |
| 6.0% | $ 69.17 |
| 6.5% | $ 63.85 |
| 7.0% | $ 59.29 |
| 7.5% | $ 55.33 |
| 8.0% | $ 51.88 |
| 8.5% | $ 48.82 |
| 9.0% | $ 46.11 |
| 9.5% | $ 43.68 |
| 10.0% | $ 41.50 |