
| 2024 | 0.76 | 1.11 | 58.29 | 68.3% |
| 2023 | 0.79 | 1.15 | 60.14 | 68.6% |
| 2022 | 0.8 | 1.17 | 61.22 | 67.9% |
| 2021 | 0.81 | 1.28 | 66.39 | 63.4% |
| 2020 | 0.79 | 1.21 | 62.33 | 65.6% |
| 2019 | 0.88 | 1.26 | 64.66 | 69.5% |
| 2018 | 0.91 | 1.27 | 64.75 | 71.6% |
| 2017 | 0.93 | 1.28 | 64.89 | 73% |
| 2016 | 0.9 | 1.21 | 61.34 | 74.6% |
| 2015 | 0.98 | 1.21 | 60.69 | 81.4% |
| 2014 | 0.98 | 1.21 | 60.7 | 80.6% |
| 2013 | 0.96 | 1.23 | 61.34 | 77.8% |
| 2012 | 1 | 1.35 | 67.12 | 74.3% |
| 2011 | 1.03 | 1.38 | 67.9 | 74.9% |
| 2010 | 1.01 | 1.32 | 64.73 | 76.2% |
| 2009 | 1.04 | 1.32 | 63.97 | 78.7% |
| 2008 | 1.08 | 1.55 | 74.7 | 69.7% |
| 2007 | 1.07 | 1.59 | 76.11 | 67.3% |
| 2006 | 1.06 | 1.6 | 75.84 | 66.4% |
| 2005 | 1.02 | 1.53 | 72.01 | 66.6% |
| 2004 | 1.03 | 1.57 | 73.54 | 65.5% |
| 2003 | 1.05 | 1.54 | 71.52 | 67.8% |
| 2002 | 1.09 | 1.55 | 71.42 | 69.9% |
| 2001 | 1.15 | 1.61 | 73.58 | 71% |
| 2000 | 1.09 | 1.45 | 65.73 | 75.4% |
| 1999 | 1.07 | 1.43 | 64.59 | 75% |
| 1998 | 1.12 | 1.6 | 71.81 | 70.1% |
| 1997 | 1.29 | 1.89 | 84.48 | 68.1% |
| 1996 | 1.32 | 1.92 | 85.36 | 68.6% |
| 1995 | 1.36 | 1.89 | 83.41 | 71.9% |
| 1994 | 1.35 | 1.77 | 77.88 | 76.3% |
| 1993 | 1.4 | 1.89 | 82.81 | 74% |
| 1992 | 1.42 | 1.98 | 86.61 | 71.6% |
| 1991 | 1.5 | 2.1 | 91.65 | 71.1% |
| 1990 | 1.77 | 2.75 | 119.9 | 64.3% |
| 1989 | 2.15 | 2.96 | 129.1 | 72.7% |
| 1988 | 2.3 | 2.87 | 125.6 | 80.3% |
| 1987 | 2.28 | 2.91 | 127.7 | 78.6% |
| 1986 | 2.3 | 2.82 | 124.4 | 81.7% |
| 1985 | 2.25 | 2.72 | 120.2 | 82.9% |
| 1984 | 2.34 | 2.71 | 120.2 | 86.3% |
| 1983 | 1.88 | 2.79 | 124.2 | 67.3% |
| 1982 | 1.78 | 2.72 | 121.7 | 65.3% |
| 1981 | 1.66 | 2.59 | 116.4 | 63.9% |
| 1980 | 1.6 | 2.63 | 118.8 | 60.8% |