
| 2024 | 5.9 | 7.79 | 59.52 | 75.7% |
| 2023 | 6.2 | 7.76 | 59.8 | 79.9% |
| 2022 | 5.95 | 7.65 | 59.45 | 77.9% |
| 2021 | 5.77 | 7.29 | 57.07 | 79.2% |
| 2020 | 5.73 | 7.14 | 56.33 | 80.3% |
| 2019 | 5.63 | 7.77 | 61.81 | 72.5% |
| 2018 | 6.04 | 7.69 | 61.77 | 78.5% |
| 2017 | 6.41 | 7.68 | 62.23 | 83.5% |
| 2016 | 7.09 | 7.63 | 62.39 | 92.9% |
| 2015 | 7.44 | 7.53 | 62.23 | 98.7% |
| 2014 | 8.08 | 7.37 | 61.52 | 109.7% |
| 2013 | 8.39 | 7.57 | 63.94 | 110.9% |
| 2012 | 8.46 | 7.47 | 63.98 | 113.2% |
| 2011 | 8.72 | 7.54 | 65.4 | 115.7% |
| 2010 | 8.64 | 7.34 | 64.58 | 117.7% |
| 2009 | 9.04 | 7.38 | 65.86 | 122.6% |
| 2008 | 9.15 | 7.36 | 66.67 | 124.4% |
| 2007 | 9.74 | 7.32 | 67.32 | 133% |
| 2006 | 10.08 | 7.2 | 67.14 | 140% |
| 2005 | 10.01 | 6.89 | 65.11 | 145.3% |
| 2004 | 10.07 | 6.7 | 64.15 | 150.3% |
| 2003 | 9.94 | 6.46 | 62.75 | 153.9% |
| 2002 | 9.38 | 6.21 | 61.16 | 151.1% |
| 2001 | 9.29 | 6.21 | 62 | 149.6% |
| 2000 | 9.06 | 6.22 | 63.06 | 145.6% |
| 1999 | 8.79 | 5.97 | 61.48 | 147.2% |
| 1998 | 9.11 | 6.03 | 63.14 | 151% |
| 1997 | 8.89 | 5.62 | 59.73 | 158.4% |
| 1996 | 8.49 | 5.49 | 59.35 | 154.7% |
| 1995 | 7.75 | 5.39 | 59.32 | 143.8% |
| 1994 | 7.84 | 5.61 | 62.88 | 139.6% |
| 1993 | 7.84 | 5.23 | 59.65 | 150% |
| 1992 | 7.76 | 4.94 | 57.47 | 157% |
| 1991 | 7.8 | 4.93 | 58.4 | 158.3% |
| 1990 | 7.49 | 4.59 | 55.43 | 163.2% |
| 1989 | 7.21 | 4.7 | 57.88 | 153.4% |
| 1988 | 7.21 | 4.47 | 56.08 | 161.4% |
| 1987 | 7.24 | 4.41 | 56.49 | 164.1% |
| 1986 | 6.97 | 4.31 | 56.31 | 161.7% |
| 1985 | 7.48 | 4.35 | 57.9 | 172.2% |
| 1984 | 7.59 | 4.12 | 56.09 | 184.1% |
| 1983 | 1.34 | 4.12 | 57.25 | 32.6% |
| 1982 | 1.34 | 4.36 | 61.92 | 30.6% |
| 1981 | 1.25 | 4.11 | 59.62 | 30.4% |
| 1980 | 1.15 | 3.77 | 56.03 | 30.6% |