| 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 | 0 |
| March | 33 |
| 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 | $ 0.14750 | 4.819% | 3 | |
| 1981 | $ 0.15250 | 3.390% | 4.865% | 3 |
| 1982 | $ 0.15500 | 1.639% | 4.974% | 3 |
| 1983 | $ 0.16687 | 7.661% | 4.883% | 3 |
| 1984 | $ 0.18500 | 10.861% | 4.675% | 3 |
| 1985 | $ 0.20375 | 10.135% | 4.478% | 3 |
| 1986 | $ 0.21750 | 6.748% | 4.392% | 3 |
| 1987 | $ 0.22750 | 4.598% | 4.384% | 3 |
| 1988 | $ 0.23500 | 3.297% | 4.429% | 3 |
| 1989 | $ 0.23625 | 0.532% | 4.602% | 3 |
| 1990 | $ 0.24250 | 2.646% | 4.692% | 3 |
| 1991 | $ 0.25250 | 4.124% | 4.719% | 3 |
| 1992 | $ 0.26000 | 2.970% | 4.808% | 3 |
| 1993 | $ 0.27250 | 4.808% | 4.808% | 3 |
| 1994 | $ 0.28250 | 3.670% | 4.871% | 3 |
| 1995 | $ 0.29000 | 2.655% | 5.003% | 3 |
| 1996 | $ 0.29750 | 2.586% | 5.156% | 3 |
| 1997 | $ 0.31000 | 4.202% | 5.220% | 3 |
| 1998 | $ 0.32625 | 5.242% | 5.218% | 3 |
| 1999 | $ 0.33500 | 2.682% | 5.416% | 4 |
| 2000 | $ 0.34250 | 2.239% | 5.685% | 4 |
| 2001 | $ 0.35250 | 2.920% | 5.940% | 4 |
| 2002 | $ 0.36250 | 2.837% | 6.255% | 4 |
| 2003 | $ 0.39000 | 7.586% | 6.109% | 4 |
| 2004 | $ 0.42500 | 8.974% | 5.756% | 4 |
| 2005 | $ 0.44500 | 4.706% | 5.907% | 4 |
| 2006 | $ 0.46500 | 4.494% | 6.144% | 4 |
| 2007 | $ 0.48500 | 4.301% | 6.516% | 5 |
| 2008 | $ 0.49250 | 1.546% | 7.796% | 4 |
| 2009 | $ 0.50500 | 2.538% | 9.608% | 4 |
| 2010 | $ 0.54000 | 6.931% | 10.972% | 4 |
| 2011 | $ 0.62000 | 14.815% | 7.258% | 0 |
| 2012 | $ 0.66500 | 7.258% |
| Yield | Price |
| 0.5% | $133.00 |
| 1.0% | $ 66.50 |
| 1.5% | $ 44.33 |
| 2.0% | $ 33.25 |
| 2.5% | $ 26.60 |
| 3.0% | $ 22.17 |
| 3.5% | $ 19.00 |
| 4.0% | $ 16.62 |
| 4.5% | $ 14.78 |
| 5.0% | $ 13.30 |
| 5.5% | $ 12.09 |
| 6.0% | $ 11.08 |
| 6.5% | $ 10.23 |
| 7.0% | $ 9.50 |
| 7.5% | $ 8.87 |
| 8.0% | $ 8.31 |
| 8.5% | $ 7.82 |
| 9.0% | $ 7.39 |
| 9.5% | $ 7.00 |
| 10.0% | $ 6.65 |