| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 144 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 0 |
| March | 36 |
| April | 0 |
| May | 0 |
| June | 36 |
| July | 0 |
| August | 0 |
| September | 36 |
| October | 0 |
| November | 1 |
| December | 35 |
| Status | Number |
| Cancelled | 0 |
| Discontinued | 0 |
| Omitted | 0 |
| Year | Dividends paid | Increase from previous year | CAGR to 2012 from | Bumpiness to 2012 from |
| 1977 | $ 0.09877 | 8.321% | 9 | |
| 1978 | $ 0.14156 | 43.333% | 7.432% | 7 |
| 1979 | $ 0.15473 | 9.302% | 7.376% | 7 |
| 1980 | $ 0.16593 | 7.234% | 7.380% | 7 |
| 1981 | $ 0.16593 | 0.000% | 7.627% | 7 |
| 1982 | $ 0.18963 | 14.285% | 7.412% | 7 |
| 1983 | $ 0.20148 | 6.251% | 7.453% | 8 |
| 1984 | $ 0.20938 | 3.922% | 7.581% | 8 |
| 1985 | $ 0.22124 | 5.661% | 7.653% | 8 |
| 1986 | $ 0.23309 | 5.356% | 7.742% | 8 |
| 1987 | $ 0.23704 | 1.695% | 7.991% | 8 |
| 1988 | $ 0.24889 | 5.000% | 8.118% | 8 |
| 1989 | $ 0.24889 | NO CHANGE | 8.485% | 8 |
| 1990 | $ 0.27259 | 9.524% | 8.438% | 8 |
| 1991 | $ 0.27259 | NO CHANGE | 8.857% | 8 |
| 1992 | $ 0.28148 | 3.261% | 9.145% | 8 |
| 1993 | $ 0.28444 | 1.053% | 9.588% | 8 |
| 1994 | $ 0.29630 | 4.167% | 9.898% | 8 |
| 1995 | $ 0.31407 | 6.000% | 10.131% | 9 |
| 1996 | $ 0.32000 | 1.887% | 10.668% | 9 |
| 1997 | $ 0.37778 | 18.056% | 10.192% | 9 |
| 1998 | $ 0.40000 | 5.882% | 10.507% | 9 |
| 1999 | $ 0.45333 | 13.333% | 10.293% | 9 |
| 2000 | $ 0.45333 | NO CHANGE | 11.197% | 9 |
| 2001 | $ 0.48000 | 5.883% | 11.693% | 9 |
| 2002 | $ 0.48000 | NO CHANGE | 12.935% | 9 |
| 2003 | $ 0.50667 | 5.556% | 13.786% | 9 |
| 2004 | $ 0.50667 | NO CHANGE | 15.638% | 8 |
| 2005 | $ 0.57333 | 13.157% | 15.996% | 8 |
| 2006 | $ 0.65333 | 13.954% | 16.340% | 9 |
| 2007 | $ 0.76667 | 17.347% | 16.140% | 10 |
| 2008 | $ 0.92000 | 20.000% | 15.195% | 11 |
| 2009 | $ 1.00000 | 8.696% | 17.446% | 11 |
| 2010 | $ 1.07000 | 7.000% | 23.045% | 10 |
| 2011 | $ 1.43000 | 33.645% | 13.287% | 0 |
| 2012 | $ 1.62000 | 13.287% |
| Yield | Price |
| 0.5% | $324.00 |
| 1.0% | $162.00 |
| 1.5% | $108.00 |
| 2.0% | $ 81.00 |
| 2.5% | $ 64.80 |
| 3.0% | $ 54.00 |
| 3.5% | $ 46.29 |
| 4.0% | $ 40.50 |
| 4.5% | $ 36.00 |
| 5.0% | $ 32.40 |
| 5.5% | $ 29.45 |
| 6.0% | $ 27.00 |
| 6.5% | $ 24.92 |
| 7.0% | $ 23.14 |
| 7.5% | $ 21.60 |
| 8.0% | $ 20.25 |
| 8.5% | $ 19.06 |
| 9.0% | $ 18.00 |
| 9.5% | $ 17.05 |
| 10.0% | $ 16.20 |