
| 2024 | 1.51 | 6.41 | 73.26 | 23.5% |
| 2023 | 1.32 | 6.15 | 70.52 | 21.5% |
| 2022 | 1.34 | 6.09 | 69.95 | 22% |
| 2021 | 1.35 | 6.21 | 71.64 | 21.7% |
| 2020 | 1.27 | 5.73 | 66.55 | 22.2% |
| 2019 | 1.38 | 5.9 | 69.15 | 23.4% |
| 2018 | 1.22 | 5.85 | 69.26 | 20.8% |
| 2017 | 1.08 | 5.97 | 71.84 | 18.1% |
| 2016 | 1.08 | 5.53 | 67.75 | 19.6% |
| 2015 | 0.94 | 5.28 | 66 | 17.8% |
| 2014 | 0.88 | 4.91 | 62.93 | 18% |
| 2013 | 0.95 | 4.68 | 61.21 | 20.3% |
| 2012 | 0.97 | 4.67 | 62.16 | 20.8% |
| 2011 | 0.99 | 4.46 | 60.1 | 22.3% |
| 2010 | 0.98 | 4.16 | 56.66 | 23.5% |
| 2009 | 0.97 | 4.08 | 56.37 | 23.6% |
| 2008 | 0.95 | 4.06 | 56.67 | 23.5% |
| 2007 | 0.92 | 4.14 | 58.59 | 22.2% |
| 2006 | 0.85 | 3.79 | 54.05 | 22.4% |
| 2005 | 0.78 | 3.46 | 49.97 | 22.6% |
| 2004 | 0.69 | 3.2 | 46.61 | 21.6% |
| 2003 | 0.67 | 3.09 | 45.51 | 21.8% |
| 2002 | 0.61 | 2.93 | 43.65 | 20.9% |
| 2001 | 0.65 | 2.74 | 41.31 | 23.7% |
| 2000 | 0.69 | 2.97 | 45.32 | 23.4% |
| 1999 | 0.74 | 2.7 | 41.8 | 27.5% |
| 1998 | 0.77 | 2.71 | 42.6 | 28.2% |
| 1997 | 0.68 | 2.64 | 41.94 | 25.8% |
| 1996 | 0.65 | 2.5 | 40.3 | 26% |
| 1995 | 0.62 | 2.29 | 37.45 | 27.1% |
| 1994 | 0.6 | 2.05 | 34.13 | 29.1% |
| 1993 | 0.56 | 2.06 | 34.92 | 27% |
| 1992 | 0.56 | 1.91 | 32.89 | 29.2% |
| 1991 | 0.5 | 1.82 | 31.89 | 27.3% |
| 1990 | 0.51 | 1.78 | 31.71 | 28.6% |
| 1989 | 0.53 | 1.67 | 30.29 | 31.9% |
| 1988 | 0.45 | 1.5 | 27.86 | 30% |
| 1987 | 0.49 | 1.52 | 28.74 | 32.4% |
| 1986 | 0.47 | 1.37 | 26.45 | 34.3% |
| 1985 | 0.4 | 1.23 | 24.19 | 32.5% |
| 1984 | 0.31 | 1.1 | 22.13 | 28.6% |
| 1983 | 0.27 | 1.05 | 21.76 | 25.2% |
| 1982 | 0.25 | 0.99 | 20.94 | 25.3% |
| 1981 | 0.23 | 0.86 | 18.47 | 26.9% |
| 1980 | 0.21 | 0.92 | 20.31 | 22.3% |