
| 2024 | 1.76 | 3.76 | 97.54 | 46.9% |
| 2023 | 1.83 | 3.78 | 97.52 | 48.5% |
| 2022 | 2.04 | 4.05 | 105.4 | 50.3% |
| 2021 | 2.15 | 4.13 | 108.5 | 52% |
| 2020 | 2.07 | 3.99 | 104.6 | 51.9% |
| 2019 | 2.26 | 4.19 | 109.5 | 54% |
| 2018 | 2.35 | 4.3 | 112.4 | 54.7% |
| 2017 | 2.45 | 4.33 | 113.2 | 56.6% |
| 2016 | 2.55 | 4.13 | 108.1 | 61.6% |
| 2015 | 2.62 | 4.05 | 105.7 | 64.7% |
| 2014 | 2.61 | 3.96 | 103.4 | 65.9% |
| 2013 | 2.72 | 4.07 | 106.4 | 66.8% |
| 2012 | 2.74 | 4.08 | 106.7 | 67.1% |
| 2011 | 2.61 | 4.07 | 106.5 | 64% |
| 2010 | 2.53 | 4.08 | 107.1 | 62% |
| 2009 | 2.55 | 3.85 | 101.4 | 66% |
| 2008 | 2.68 | 3.97 | 104.6 | 67.5% |
| 2007 | 2.72 | 3.94 | 103.7 | 68.9% |
| 2006 | 2.9 | 3.89 | 102.1 | 74.5% |
| 2005 | 2.96 | 3.83 | 100.5 | 77.2% |
| 2004 | 3.01 | 3.83 | 100.4 | 78.7% |
| 2003 | 3.01 | 3.77 | 98.57 | 79.9% |
| 2002 | 2.99 | 3.63 | 95.04 | 82.3% |
| 2001 | 3.02 | 3.71 | 97.12 | 81.3% |
| 2000 | 2.98 | 3.69 | 96.56 | 80.7% |
| 1999 | 3.12 | 3.79 | 99.11 | 82.3% |
| 1998 | 3.27 | 3.9 | 101.8 | 83.7% |
| 1997 | 3.71 | 4.16 | 108.6 | 89% |
| 1996 | 3.71 | 4.24 | 110.6 | 87.4% |
| 1995 | 3.69 | 4.01 | 104.4 | 92.1% |
| 1994 | 3.66 | 3.98 | 103.7 | 92.1% |
| 1993 | 3.63 | 4.06 | 106 | 89.3% |
| 1992 | 3.6 | 3.99 | 104.4 | 90.3% |
| 1991 | 3.81 | 4.17 | 109.2 | 91.4% |
| 1990 | 3.92 | 4.26 | 112.1 | 92% |
| 1989 | 4.57 | 5.12 | 134.8 | 89.4% |
| 1988 | 4.89 | 5.31 | 140.4 | 92.1% |
| 1987 | 4.89 | 5.42 | 143.9 | 90.2% |
| 1986 | 4.77 | 5.15 | 137.5 | 92.6% |
| 1985 | 4.61 | 4.92 | 132.2 | 93.8% |
| 1984 | 4.47 | 4.66 | 126.4 | 95.9% |
| 1983 | 4.3 | 4.47 | 122.3 | 96.2% |
| 1982 | 4.19 | 4.4 | 121.4 | 95.1% |
| 1981 | 3.7 | 4.37 | 121.6 | 84.8% |
| 1980 | 4.28 | 4.75 | 133.4 | 90.1% |