| Frequency | Number of dividends |
| Annually | 11 |
| Semi-annually | 36 |
| Quarterly | 0 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Current frequency is semi-annually.
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 0 |
| March | 1 |
| April | 28 |
| May | 0 |
| June | 0 |
| July | 0 |
| August | 0 |
| September | 0 |
| October | 18 |
| November | 0 |
| 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 |
| 1985 | $ 0.01765 | 14.354% | 17 | |
| 1986 | $ 0.02136 | 21.002% | 14.106% | 17 |
| 1987 | $ 0.02937 | 37.499% | 13.258% | 17 |
| 1988 | $ 0.03876 | 31.999% | 12.537% | 17 |
| 1989 | $ 0.03876 | NO CHANGE | 13.117% | 17 |
| 1990 | $ 0.05169 | 33.335% | 12.274% | 17 |
| 1991 | $ 0.06105 | 18.125% | 12.003% | 17 |
| 1992 | $ 0.07123 | 16.667% | 11.775% | 17 |
| 1993 | $ 0.08227 | 15.499% | 11.582% | 18 |
| 1994 | $ 0.10994 | 33.637% | 10.470% | 18 |
| 1995 | $ 0.18718 | 70.250% | 7.694% | 10 |
| 1996 | $ 0.14875 | DECREASE | 9.760% | 8 |
| 1997 | $ 0.17571 | 18.125% | 9.223% | 8 |
| 1998 | $ 0.20000 | 13.821% | 8.902% | 8 |
| 1999 | $ 0.23000 | 15.000% | 8.447% | 8 |
| 2000 | $ 0.30000 | 30.435% | 6.791% | 5 |
| 2001 | $ 0.30000 | NO CHANGE | 7.431% | 5 |
| 2002 | $ 0.30000 | NO CHANGE | 8.204% | 5 |
| 2003 | $ 0.36000 | 20.000% | 6.967% | 3 |
| 2004 | $ 0.36000 | NO CHANGE | 7.871% | 2 |
| 2005 | $ 0.38000 | 5.556% | 8.206% | 1 |
| 2006 | $ 0.42000 | 10.526% | 7.824% | 1 |
| 2007 | $ 0.46000 | 9.524% | 7.487% | 1 |
| 2008 | $ 0.50000 | 8.696% | 7.187% | 1 |
| 2009 | $ 0.54000 | 8.000% | 6.918% | 0 |
| 2010 | $ 0.58000 | 7.407% | 6.674% | 0 |
| 2011 | $ 0.62000 | 6.897% | 6.452% | 0 |
| 2012 | $ 0.66000 | 6.452% |
| Yield | Price |
| 0.5% | $132.00 |
| 1.0% | $ 66.00 |
| 1.5% | $ 44.00 |
| 2.0% | $ 33.00 |
| 2.5% | $ 26.40 |
| 3.0% | $ 22.00 |
| 3.5% | $ 18.86 |
| 4.0% | $ 16.50 |
| 4.5% | $ 14.67 |
| 5.0% | $ 13.20 |
| 5.5% | $ 12.00 |
| 6.0% | $ 11.00 |
| 6.5% | $ 10.15 |
| 7.0% | $ 9.43 |
| 7.5% | $ 8.80 |
| 8.0% | $ 8.25 |
| 8.5% | $ 7.76 |
| 9.0% | $ 7.33 |
| 9.5% | $ 6.95 |
| 10.0% | $ 6.60 |