
| 2024 | 0.62 | 0.66 | 24.91 | 93.8% |
| 2023 | 0.59 | 0.63 | 23.9 | 93.7% |
| 2022 | 0.59 | 0.62 | 23.58 | 94.3% |
| 2021 | 0.59 | 0.63 | 24.02 | 94.3% |
| 2020 | 0.7 | 0.74 | 28.43 | 94.2% |
| 2019 | 0.74 | 0.78 | 29.99 | 94.2% |
| 2018 | 0.67 | 0.71 | 27.31 | 94.3% |
| 2017 | 0.79 | 0.78 | 30.14 | 101.3% |
| 2016 | 0.89 | 0.42 | 16.46 | 210.7% |
| 2015 | 0.81 | 0.42 | 16.26 | 194.6% |
| 2014 | 0.82 | 0.47 | 18.39 | 176.2% |
| 2013 | 0.82 | 0.48 | 18.81 | 171.6% |
| 2012 | 0.68 | 0.51 | 20.25 | 133.8% |
| 2011 | 0.67 | 0.54 | 21.4 | 125.3% |
| 2010 | 0.66 | 0.75 | 30.08 | 87.7% |
| 2009 | 0.65 | 0.8 | 32.01 | 82.1% |
| 2008 | 0.83 | 0.93 | 37.44 | 89.9% |
| 2007 | 0.78 | 0.85 | 34.68 | 91.8% |
| 2006 | 0.9 | 0.96 | 39.12 | 93.4% |
| 2005 | 0.89 | 1 | 41.04 | 88.5% |
| 2004 | 0.81 | 1.01 | 41.81 | 80% |
| 2003 | 0.77 | 0.98 | 40.5 | 79% |
| 2002 | 0.75 | 0.98 | 41.1 | 75.7% |
| 2001 | 0.77 | 1.01 | 42.44 | 76.4% |
| 2000 | 0.75 | 1.04 | 43.88 | 72.4% |
| 1999 | 0.7 | 1.15 | 48.94 | 61.3% |
| 1998 | 0.63 | 0.9 | 38.55 | 69.8% |
| 1997 | 0.69 | 1.02 | 43.97 | 68.2% |
| 1996 | 0.71 | 1.04 | 45.37 | 68.5% |
| 1995 | 0.8 | 1.08 | 47.66 | 74.4% |
| 1994 | 0.86 | 0.94 | 41.76 | 91.6% |
| 1993 | 0.91 | 0.97 | 43.77 | 94.1% |
| 1992 | 0.99 | 0.89 | 40.86 | 111.6% |
| 1991 | 0.96 | 0.87 | 40.71 | 110.5% |
| 1990 | 0.92 | 0.87 | 41.37 | 105.8% |
| 1989 | 0.7 | 0.86 | 41.43 | 81.8% |
| 1988 | 0.9 | 1.07 | 51.96 | 84.2% |
| 1987 | 0.75 | 0.9 | 44.47 | 83.3% |
| 1986 | 0.75 | 0.92 | 46.13 | 81.8% |
| 1985 | 0.75 | 0.91 | 46.62 | 82.4% |
| 1984 | 0.94 | 1.1 | 56.93 | 85.4% |
| 1983 | 0.92 | 1.07 | 56.14 | 85.8% |
| 1982 | 0.91 | 1.02 | 54.42 | 88.8% |
| 1981 | 0.86 | 0.98 | 52.78 | 88.5% |
| 1980 | 0.83 | 0.94 | 51.47 | 88.6% |