
| 2024 | 5.5 | 5.39 | 84.28 | 101.9% |
| 2023 | 5.49 | 5.46 | 86.38 | 100.6% |
| 2022 | 5.61 | 5.43 | 87.03 | 103.3% |
| 2021 | 5.34 | 5.3 | 86.22 | 100.7% |
| 2020 | 5.62 | 5.63 | 93.03 | 99.7% |
| 2019 | 5.86 | 5.91 | 99.21 | 99.1% |
| 2018 | 5.77 | 5.46 | 93.15 | 105.8% |
| 2017 | 5.85 | 5.68 | 98.49 | 103.1% |
| 2016 | 5.82 | 5.52 | 96.39 | 105.5% |
| 2015 | 5.82 | 5.56 | 98.05 | 104.6% |
| 2014 | 5.94 | 5.58 | 100.4 | 106.3% |
| 2013 | 5.82 | 5.65 | 103.3 | 103.1% |
| 2012 | 5.86 | 5.61 | 104.4 | 104.4% |
| 2011 | 5.85 | 5.53 | 104.4 | 105.8% |
| 2010 | 5.77 | 5.61 | 107.2 | 102.9% |
| 2009 | 5.66 | 5.49 | 106.2 | 103.1% |
| 2008 | 5.76 | 5.59 | 109.4 | 103% |
| 2007 | 5.65 | 5.53 | 109.4 | 102.3% |
| 2006 | 5.62 | 5.22 | 104.3 | 107.8% |
| 2005 | 5.61 | 5.15 | 104.2 | 108.7% |
| 2004 | 5.63 | 5.06 | 103.2 | 111.2% |
| 2003 | 5.49 | 4.97 | 102.5 | 110.5% |
| 2002 | 5.09 | 4.74 | 98.63 | 107.4% |
| 2001 | 5.13 | 4.56 | 95.88 | 112.4% |
| 2000 | 5.17 | 4.63 | 98.24 | 111.6% |
| 1999 | 4.94 | 4.48 | 95.91 | 110.3% |
| 1998 | 5 | 4.6 | 99.54 | 108.6% |
| 1997 | 4.86 | 4.5 | 98.59 | 107.9% |
| 1996 | 4.62 | 4.34 | 96.27 | 106.3% |
| 1995 | 4.59 | 4.2 | 94.34 | 109.2% |
| 1994 | 4.36 | 3.97 | 90.28 | 109.8% |
| 1993 | 4.05 | 3.88 | 89.68 | 104.4% |
| 1992 | 3.89 | 3.83 | 90.19 | 101.7% |
| 1991 | 3.92 | 3.8 | 91.19 | 103.1% |
| 1990 | 3.86 | 3.81 | 93.48 | 101.4% |
| 1989 | 3.99 | 3.69 | 93.1 | 108.2% |
| 1988 | 4.1 | 3.67 | 95.41 | 111.6% |
| 1987 | 3.94 | 3.6 | 96.51 | 109.4% |
| 1986 | 3.97 | 3.47 | 96.03 | 114.3% |
| 1985 | 3.86 | 3.43 | 97.93 | 112.6% |
| 1984 | 3.62 | 3.37 | 99.42 | 107.3% |
| 1983 | 3.2 | 3.12 | 95.32 | 102.4% |
| 1982 | 3.04 | 3.02 | 95.65 | 100.6% |
| 1981 | 2.81 | 2.82 | 92.44 | 99.5% |
| 1980 | 2.53 | 2.62 | 88.67 | 96.6% |