| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 132 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 33 |
| March | 0 |
| April | 0 |
| May | 33 |
| June | 0 |
| July | 0 |
| August | 33 |
| September | 0 |
| October | 0 |
| November | 33 |
| 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 |
| 1980 | $ 0.44000 | 10.184% | 20 | |
| 1981 | $ 0.50000 | 13.636% | 10.074% | 21 |
| 1982 | $ 0.56000 | 12.000% | 10.011% | 21 |
| 1983 | $ 0.66000 | 17.857% | 9.750% | 21 |
| 1984 | $ 0.80000 | 21.212% | 9.361% | 22 |
| 1985 | $ 0.96000 | 20.000% | 8.985% | 22 |
| 1986 | $ 1.12000 | 16.667% | 8.700% | 22 |
| 1987 | $ 1.28000 | 14.286% | 8.483% | 23 |
| 1988 | $ 1.56000 | 21.875% | 7.958% | 23 |
| 1989 | $ 1.84000 | 17.949% | 7.543% | 23 |
| 1990 | $ 4.00000 | 117.391% | 4.157% | 4 |
| 1991 | $ 4.20000 | 5.000% | 4.117% | 4 |
| 1992 | $ 4.20000 | NO CHANGE | 4.328% | 4 |
| 1993 | $ 4.20000 | NO CHANGE | 4.560% | 4 |
| 1994 | $ 4.20000 | NO CHANGE | 4.820% | 4 |
| 1995 | $ 4.40000 | 4.762% | 4.823% | 4 |
| 1996 | $ 4.60000 | 4.545% | 4.841% | 4 |
| 1997 | $ 4.80000 | 4.348% | 4.873% | 5 |
| 1998 | $ 5.00000 | 4.167% | 4.924% | 5 |
| 1999 | $ 5.20000 | 4.000% | 4.996% | 5 |
| 2000 | $ 5.40000 | 3.846% | 5.092% | 5 |
| 2001 | $ 5.60000 | 3.704% | 5.219% | 5 |
| 2002 | $ 5.60000 | NO CHANGE | 5.756% | 5 |
| 2003 | $ 5.80000 | 3.571% | 6.001% | 5 |
| 2004 | $ 7.00000 | 20.690% | 4.296% | 2 |
| 2005 | $ 7.40000 | 5.714% | 4.094% | 2 |
| 2006 | $ 7.80000 | 5.405% | 3.878% | 2 |
| 2007 | $ 8.20000 | 5.128% | 3.629% | 2 |
| 2008 | $ 8.60000 | 4.878% | 3.319% | 2 |
| 2009 | $ 8.60000 | NO CHANGE | 4.450% | 0 |
| 2010 | $ 9.00000 | 4.651% | 4.350% | 0 |
| 2011 | $ 9.40000 | 4.444% | 4.255% | 0 |
| 2012 | $ 9.80000 | 4.255% |
| Yield | Price |
| 0.5% | $1960.00 |
| 1.0% | $980.00 |
| 1.5% | $653.33 |
| 2.0% | $490.00 |
| 2.5% | $392.00 |
| 3.0% | $326.67 |
| 3.5% | $280.00 |
| 4.0% | $245.00 |
| 4.5% | $217.78 |
| 5.0% | $196.00 |
| 5.5% | $178.18 |
| 6.0% | $163.33 |
| 6.5% | $150.77 |
| 7.0% | $140.00 |
| 7.5% | $130.67 |
| 8.0% | $122.50 |
| 8.5% | $115.29 |
| 9.0% | $108.89 |
| 9.5% | $103.16 |
| 10.0% | $ 98.00 |