
| 2024 | 0.57 | 0.48 | 8.78 | 118.1% |
| 2023 | 0.57 | 0.44 | 8.13 | 129.2% |
| 2022 | 0.63 | 0.46 | 8.51 | 138.5% |
| 2021 | 0.72 | 0.5 | 9.41 | 144% |
| 2020 | 0.72 | 0.54 | 10.11 | 133.5% |
| 2019 | 0.74 | 0.52 | 9.84 | 143.1% |
| 2018 | 0.72 | 0.53 | 10.14 | 135.8% |
| 2017 | 0.76 | 0.51 | 9.79 | 150.3% |
| 2016 | 0.78 | 0.39 | 7.51 | 200.4% |
| 2015 | 0.72 | 0.33 | 6.47 | 218.4% |
| 2014 | 0.64 | 0.36 | 7.1 | 178.8% |
| 2013 | 0.54 | 0.3 | 5.96 | 181.1% |
| 2012 | 0.53 | 0.26 | 5.18 | 203.5% |
| 2011 | 0.52 | 0.21 | 4.23 | 249.3% |
| 2010 | 0.52 | 0.21 | 4.19 | 254.9% |
| 2009 | 0.5 | 0.2 | 4.06 | 251.4% |
| 2008 | 0.53 | 0.22 | 4.64 | 235.1% |
| 2007 | 0.57 | 0.25 | 5.18 | 229.1% |
| 2006 | 0.54 | 0.23 | 4.84 | 232.6% |
| 2005 | 0.55 | 0.25 | 5.23 | 221.4% |
| 2004 | 0.44 | 0.19 | 4.08 | 227.7% |
| 2003 | 0.42 | 0.18 | 3.91 | 227.8% |
| 2002 | 0.37 | 0.16 | 3.47 | 229% |
| 2001 | 0.27 | 0.14 | 3.03 | 194.4% |
| 2000 | 0.15 | 0.15 | 3.34 | 101% |
| 1999 | 0.08 | 0.14 | 3.02 | 58.1% |
| 1998 | 0.09 | 0.13 | 3.03 | 65.6% |
| 1997 | 0.08 | 0.12 | 2.64 | 70.3% |
| 1996 | 0.08 | 0.11 | 2.49 | 78.5% |
| 1995 | 0.09 | 0.11 | 2.5 | 82.6% |
| 1994 | 0.09 | 0.1 | 2.38 | 89% |
| 1993 | 0.08 | 0.08 | 2 | 92.7% |
| 1992 | 0.07 | 0.08 | 1.91 | 94.6% |
| 1991 | 0.08 | 0.08 | 1.89 | 99.5% |
| 1990 | 0.08 | 0.08 | 1.95 | 101.3% |
| 1989 | 0.08 | 0.08 | 2.05 | 97.2% |
| 1988 | 0.08 | 0.08 | 2.04 | 97.1% |
| 1987 | 0.09 | 0.08 | 2.15 | 111.8% |
| 1986 | 0.11 | 0.08 | 2.21 | 130.2% |
| 1985 | 0.1 | 0.08 | 2.21 | 118.9% |
| 1984 | 0.1 | 0.08 | 2.23 | 122.2% |
| 1983 | 0.02 | 0.07 | 2.08 | 34.1% |
| 1982 | 0.02 | 0.07 | 2.09 | 29.9% |
| 1981 | 0.02 | 0.07 | 1.93 | 25.8% |
| 1980 | 0.02 | 0.06 | 1.91 | 23.8% |