
| 2024 | 3.2 | 4.33 | 37.16 | 73.9% |
| 2023 | 3.62 | 4.25 | 37.1 | 85.2% |
| 2022 | 3.91 | 4.11 | 36.45 | 95.2% |
| 2021 | 4.01 | 4.05 | 36.53 | 99.1% |
| 2020 | 3.77 | 3.69 | 33.74 | 102.3% |
| 2019 | 4.01 | 3.62 | 33.64 | 110.8% |
| 2018 | 3.82 | 3.82 | 36.11 | 100.2% |
| 2017 | 3.45 | 3.92 | 37.78 | 87.9% |
| 2016 | 3.1 | 3.68 | 36.16 | 84.3% |
| 2015 | 3.23 | 3.64 | 36.52 | 88.9% |
| 2014 | 3.37 | 3.63 | 37.26 | 92.7% |
| 2013 | 3.66 | 3.65 | 38.28 | 100.4% |
| 2012 | 3.81 | 3.69 | 39.59 | 103.2% |
| 2011 | 3.82 | 3.53 | 38.74 | 108.1% |
| 2010 | 3.81 | 3.41 | 38.25 | 111.6% |
| 2009 | 3.83 | 3.28 | 37.44 | 117% |
| 2008 | 3.68 | 3.11 | 36.25 | 118.2% |
| 2007 | 3.54 | 2.99 | 35.51 | 118.3% |
| 2006 | 3.45 | 2.83 | 34.21 | 122% |
| 2005 | 3.01 | 2.66 | 32.86 | 113% |
| 2004 | 2.69 | 2.54 | 32 | 105.9% |
| 2003 | 2.69 | 2.34 | 30.12 | 114.8% |
| 2002 | 2.47 | 2.15 | 28.15 | 115% |
| 2001 | 2.47 | 2.14 | 28.63 | 115.5% |
| 2000 | 2.26 | 1.91 | 26.16 | 118.2% |
| 1999 | 2.4 | 1.84 | 25.7 | 130.5% |
| 1998 | 2.39 | 1.81 | 25.93 | 132% |
| 1997 | 2.43 | 1.75 | 25.59 | 138.6% |
| 1996 | 2.5 | 1.69 | 25.23 | 147.8% |
| 1995 | 2.51 | 1.56 | 23.73 | 160.9% |
| 1994 | 2.48 | 1.52 | 23.65 | 163.4% |
| 1993 | 2.51 | 1.44 | 22.93 | 173.8% |
| 1992 | 2.39 | 1.37 | 22.25 | 174.5% |
| 1991 | 2.33 | 1.36 | 22.72 | 170.7% |
| 1990 | 2.3 | 1.35 | 23.16 | 169.9% |
| 1989 | 2.23 | 1.29 | 22.74 | 173.3% |
| 1988 | 2.19 | 1.25 | 22.64 | 175.4% |
| 1987 | 2.25 | 1.23 | 22.97 | 182.7% |
| 1986 | 2.01 | 1.19 | 22.7 | 169.4% |
| 1985 | 2.15 | 1.16 | 22.93 | 184.7% |
| 1984 | 1.98 | 1.09 | 22.05 | 182.8% |
| 1983 | 0.15 | 0.99 | 20.67 | 15.5% |
| 1982 | 0.13 | 0.85 | 18.32 | 15.7% |
| 1981 | 0.09 | 0.76 | 16.82 | 11.4% |
| 1980 | 0.06 | 0.65 | 14.71 | 10% |