
| 2024 | 0.07 | 0.34 | 18.53 | 20.8% |
| 2023 | 0.07 | 0.33 | 18.12 | 20.8% |
| 2022 | 0.08 | 0.33 | 18.33 | 23.2% |
| 2021 | 0.08 | 0.35 | 20.05 | 22.1% |
| 2020 | 0.07 | 0.3 | 17.56 | 22% |
| 2019 | 0.07 | 0.31 | 18.14 | 21.5% |
| 2018 | 0.07 | 0.29 | 17.1 | 23.6% |
| 2017 | 0.06 | 0.28 | 16.89 | 22% |
| 2016 | 0.06 | 0.27 | 16.61 | 22.9% |
| 2015 | 0.06 | 0.25 | 15.47 | 24.1% |
| 2014 | 0.06 | 0.21 | 13.61 | 28.3% |
| 2013 | 0.06 | 0.2 | 13.13 | 28.5% |
| 2012 | 0.06 | 0.19 | 12.47 | 30.2% |
| 2011 | 0.05 | 0.18 | 12.03 | 28.7% |
| 2010 | 0.06 | 0.18 | 12.37 | 31.8% |
| 2009 | 0.05 | 0.18 | 12.7 | 27.5% |
| 2008 | 0.06 | 0.17 | 12.04 | 33.5% |
| 2007 | 0.06 | 0.18 | 13.51 | 30.4% |
| 2006 | 0.05 | 0.17 | 12.56 | 32.6% |
| 2005 | 0.06 | 0.16 | 12.13 | 36.4% |
| 2004 | 0.06 | 0.15 | 11.73 | 38.7% |
| 2003 | 0.07 | 0.16 | 12.75 | 42% |
| 2002 | 0.07 | 0.16 | 12.71 | 42.5% |
| 2001 | 0.06 | 0.15 | 12.73 | 39% |
| 2000 | 0.06 | 0.14 | 12.29 | 42% |
| 1999 | 0.06 | 0.14 | 12.07 | 46.7% |
| 1998 | 0.06 | 0.13 | 11.61 | 48.5% |
| 1997 | 0.06 | 0.11 | 10.1 | 50.2% |
| 1996 | 0.04 | 0.1 | 9.46 | 43.5% |
| 1995 | 0.03 | 0.1 | 9.34 | 32.5% |
| 1994 | 0.03 | 0.09 | 8.78 | 29.6% |
| 1993 | 0.02 | 0.08 | 8.01 | 29.8% |
| 1992 | 0.02 | 0.07 | 7.69 | 28.4% |
| 1991 | 0.02 | 0.06 | 6.78 | 27.4% |
| 1990 | 0.02 | 0.07 | 7.22 | 29% |
| 1989 | 0.01 | 0.06 | 6.89 | 24% |
| 1988 | 0.01 | 0.06 | 6.92 | 23% |
| 1987 | 0.01 | 0.05 | 6.46 | 24.1% |
| 1986 | 0.02 | 0.05 | 6.56 | 32.6% |
| 1985 | 0.0094 | 0.06 | 7.05 | 17% |
| 1984 | 0.01 | 0.05 | 6.44 | 23.1% |
| 1983 | 0.0033 | 0.06 | 7.51 | 5.9% |
| 1982 | 0.0023 | 0.05 | 7.28 | 4.4% |
| 1981 | 0.0017 | 0.05 | 7.37 | 3.3% |
| 1980 | 0.004 | 0.06 | 9.07 | 6.3% |