
| 2024 | 0.2 | 0.19 | 26.98 | 107.6% |
| 2023 | 0.16 | 0.15 | 22.62 | 105.1% |
| 2022 | 0.16 | 0.18 | 26.38 | 90.8% |
| 2021 | 0.15 | 0.19 | 27.86 | 80.8% |
| 2020 | 0.17 | 0.17 | 25.8 | 101.3% |
| 2019 | 0.18 | 0.18 | 26.95 | 103.7% |
| 2018 | 0.21 | 0.18 | 27.52 | 120.2% |
| 2017 | 0.21 | 0.17 | 26.42 | 127% |
| 2016 | 0.23 | 0.16 | 26.13 | 138.2% |
| 2015 | 0.2 | 0.14 | 23.33 | 137.9% |
| 2014 | 0.2 | 0.12 | 20.47 | 157.4% |
| 2013 | 0.21 | 0.12 | 19.65 | 180.7% |
| 2012 | 0.21 | 0.12 | 19.65 | 181.1% |
| 2011 | 0.2 | 0.11 | 18.55 | 186% |
| 2010 | 0.19 | 0.1 | 18.15 | 181% |
| 2009 | 0.19 | 0.09 | 16.46 | 204.6% |
| 2008 | 0.19 | 0.09 | 15.86 | 215.7% |
| 2007 | 0.19 | 0.09 | 15.29 | 218.6% |
| 2006 | 0.19 | 0.08 | 14.7 | 229.7% |
| 2005 | 0.18 | 0.07 | 13.69 | 235.1% |
| 2004 | 0.18 | 0.08 | 14.32 | 229.9% |
| 2003 | 0.18 | 0.08 | 14.21 | 233.5% |
| 2002 | 0.16 | 0.07 | 13.91 | 224.8% |
| 2001 | 0.15 | 0.07 | 13.38 | 222.8% |
| 2000 | 0.18 | 0.07 | 13.29 | 269.4% |
| 1999 | 0.18 | 0.08 | 15.23 | 231.1% |
| 1998 | 0.17 | 0.07 | 13.48 | 260.7% |
| 1997 | 0.17 | 0.06 | 12.09 | 297% |
| 1996 | 0.15 | 0.05 | 11.27 | 291% |
| 1995 | 0.14 | 0.06 | 13.04 | 239.3% |
| 1994 | 0.12 | 0.05 | 11.71 | 236.2% |
| 1993 | 0.11 | 0.05 | 10.59 | 232% |
| 1992 | 0.09 | 0.04 | 10.05 | 218.8% |
| 1991 | 0.1 | 0.04 | 9.32 | 261.9% |
| 1990 | 0.09 | 0.04 | 10.13 | 229% |
| 1989 | 0.08 | 0.05 | 11.92 | 178.5% |
| 1988 | 0.07 | 0.04 | 9.67 | 186.1% |
| 1987 | 0.06 | 0.04 | 10.3 | 167.7% |
| 1986 | 0.04 | 0.03 | 8.09 | 142% |
| 1985 | 0.01 | 0.03 | 7.94 | 51.7% |
| 1984 | 0.004 | 0.02 | 7.19 | 16.2% |
| 1983 | 0.0034 | 0.02 | 6.94 | 14.7% |
| 1982 | 0.0029 | 0.02 | 6.75 | 13.5% |
| 1981 | 0.0031 | 0.02 | 6.96 | 14.1% |
| 1980 | 0.0028 | 0.02 | 7.54 | 12.1% |