
| 2024 | 0.98 | 1.04 | 30.53 | 93.8% |
| 2023 | 0.96 | 1.05 | 31.1 | 91.4% |
| 2022 | 0.93 | 1.02 | 30.57 | 90.9% |
| 2021 | 0.85 | 0.95 | 28.63 | 89.4% |
| 2020 | 0.88 | 0.79 | 24.15 | 110.7% |
| 2019 | 0.98 | 0.96 | 29.53 | 102.1% |
| 2018 | 0.93 | 0.92 | 28.88 | 100.8% |
| 2017 | 0.92 | 0.92 | 29.37 | 100.4% |
| 2016 | 0.95 | 0.94 | 30.48 | 100.8% |
| 2015 | 0.92 | 0.9 | 29.69 | 101.5% |
| 2014 | 0.97 | 0.87 | 28.9 | 111.6% |
| 2013 | 0.93 | 0.85 | 28.49 | 109.1% |
| 2012 | 0.88 | 0.83 | 28.13 | 106.2% |
| 2011 | 0.86 | 0.77 | 26.31 | 111.9% |
| 2010 | 0.69 | 0.74 | 25.42 | 93.1% |
| 2009 | 0.51 | 0.65 | 22.42 | 78.9% |
| 2008 | 0.48 | 0.65 | 22.64 | 73.5% |
| 2007 | 0.42 | 0.54 | 18.92 | 77.6% |
| 2006 | 0.39 | 0.52 | 18.24 | 75.3% |
| 2005 | 0.36 | 0.5 | 17.94 | 72.4% |
| 2004 | 0.3 | 0.48 | 17.16 | 63.5% |
| 2003 | 0.29 | 0.42 | 15.15 | 70.4% |
| 2002 | 0.28 | 0.42 | 15.36 | 68% |
| 2001 | 0.29 | 0.41 | 15.32 | 70.1% |
| 2000 | 0.29 | 0.43 | 16.31 | 66.4% |
| 1999 | 0.3 | 0.43 | 16.37 | 69.6% |
| 1998 | 0.31 | 0.41 | 15.82 | 76.9% |
| 1997 | 0.31 | 0.39 | 15.63 | 77.9% |
| 1996 | 0.34 | 0.41 | 16.69 | 81.6% |
| 1995 | 0.34 | 0.39 | 15.83 | 87.7% |
| 1994 | 0.35 | 0.36 | 15.18 | 96.2% |
| 1993 | 0.34 | 0.35 | 14.85 | 98.8% |
| 1992 | 0.3 | 0.31 | 13.38 | 99.2% |
| 1991 | 0.31 | 0.3 | 13.41 | 102.3% |
| 1990 | 0.33 | 0.31 | 14.24 | 106.8% |
| 1989 | 0.34 | 0.34 | 15.56 | 102.4% |
| 1988 | 0.4 | 0.38 | 18.08 | 103.9% |
| 1987 | 0.44 | 0.38 | 18.4 | 115.6% |
| 1986 | 0.48 | 0.38 | 18.96 | 126.4% |
| 1985 | 0.5 | 0.35 | 17.97 | 141.8% |
| 1984 | 0.49 | 0.35 | 18.38 | 139.1% |
| 1983 | 0.08 | 0.34 | 18.32 | 23.8% |
| 1982 | 0.08 | 0.37 | 20.33 | 22.1% |
| 1981 | 0.08 | 0.37 | 20.99 | 22.4% |
| 1980 | 0.07 | 0.35 | 20.37 | 19.5% |