
| 2024 | 0.11 | 0.42 | 34.2 | 25.8% |
| 2023 | 0.13 | 0.42 | 34.15 | 30.9% |
| 2022 | 0.13 | 0.42 | 34.76 | 31.8% |
| 2021 | 0.15 | 0.42 | 34.87 | 34.9% |
| 2020 | 0.12 | 0.38 | 32.1 | 30.9% |
| 2019 | 0.12 | 0.42 | 34.99 | 29.2% |
| 2018 | 0.13 | 0.41 | 34.78 | 31.6% |
| 2017 | 0.14 | 0.4 | 34.43 | 33.7% |
| 2016 | 0.14 | 0.38 | 32.84 | 36.7% |
| 2015 | 0.14 | 0.38 | 33.28 | 37.4% |
| 2014 | 0.17 | 0.37 | 32.56 | 47.2% |
| 2013 | 0.2 | 0.33 | 29.96 | 60.5% |
| 2012 | 0.21 | 0.32 | 28.68 | 65.6% |
| 2011 | 0.21 | 0.29 | 26.46 | 73.3% |
| 2010 | 0.24 | 0.3 | 28.03 | 79% |
| 2009 | 0.24 | 0.29 | 27.62 | 80.5% |
| 2008 | 0.29 | 0.35 | 33.54 | 82.2% |
| 2007 | 0.27 | 0.31 | 29.26 | 87.7% |
| 2006 | 0.25 | 0.34 | 33.12 | 73% |
| 2005 | 0.25 | 0.36 | 35.4 | 70.1% |
| 2004 | 0.25 | 0.33 | 32.89 | 74.4% |
| 2003 | 0.24 | 0.33 | 32.55 | 71.8% |
| 2002 | 0.25 | 0.33 | 33.43 | 73.6% |
| 2001 | 0.24 | 0.34 | 34.13 | 72.3% |
| 2000 | 0.24 | 0.3 | 31.07 | 78.9% |
| 1999 | 0.25 | 0.29 | 29.84 | 87.5% |
| 1998 | 0.25 | 0.29 | 29.99 | 88.5% |
| 1997 | 0.24 | 0.27 | 28.25 | 88.6% |
| 1996 | 0.22 | 0.23 | 24.64 | 94.7% |
| 1995 | 0.2 | 0.21 | 23.29 | 95.1% |
| 1994 | 0.21 | 0.24 | 26.2 | 88.2% |
| 1993 | 0.22 | 0.22 | 24.61 | 103.2% |
| 1992 | 0.26 | 0.19 | 21.99 | 136.6% |
| 1991 | 0.24 | 0.17 | 19.41 | 147.2% |
| 1990 | 0.22 | 0.2 | 24.05 | 108.9% |
| 1989 | 0.24 | 0.2 | 24.72 | 118.1% |
| 1988 | 0.23 | 0.18 | 22.58 | 129% |
| 1987 | 0.24 | 0.17 | 21.5 | 141.1% |
| 1986 | 0.25 | 0.18 | 23.73 | 137.9% |
| 1985 | 0.25 | 0.17 | 23.06 | 148.6% |
| 1984 | 0.26 | 0.17 | 23.05 | 158.6% |
| 1983 | 0.02 | 0.15 | 21.43 | 13.1% |
| 1982 | 0.02 | 0.13 | 19.39 | 16.7% |
| 1981 | 0.02 | 0.14 | 20.73 | 12.4% |
| 1980 | 0.02 | 0.13 | 19.44 | 12.6% |