
| 2024 | 1.96 | 15.66 | 133.5 | 12.5% |
| 2023 | 2.05 | 16.12 | 136.7 | 12.7% |
| 2022 | 1.73 | 16.44 | 138.8 | 10.5% |
| 2021 | 1.82 | 16.96 | 142.4 | 10.7% |
| 2020 | 1.54 | 16.95 | 141.6 | 9.1% |
| 2019 | 1.69 | 18.18 | 151.4 | 9.3% |
| 2018 | 1.5 | 18.55 | 154.2 | 8.1% |
| 2017 | 1.3 | 18.76 | 155.8 | 6.9% |
| 2016 | 1.08 | 18.77 | 155.7 | 5.7% |
| 2015 | 0.87 | 18.69 | 154.9 | 4.7% |
| 2014 | 0.79 | 19.18 | 158.7 | 4.1% |
| 2013 | 0.85 | 19.79 | 163.5 | 4.3% |
| 2012 | 0.87 | 19.88 | 163.9 | 4.4% |
| 2011 | 2.3 | 20.31 | 167.2 | 11.3% |
| 2010 | 3.55 | 20.99 | 172.8 | 16.9% |
| 2009 | 3.35 | 19.97 | 164.4 | 16.8% |
| 2008 | 3.12 | 20.89 | 172 | 14.9% |
| 2007 | 3.36 | 21.85 | 180 | 15.4% |
| 2006 | 3.63 | 21.94 | 180.9 | 16.6% |
| 2005 | 3.46 | 21.85 | 180.2 | 15.9% |
| 2004 | 3.35 | 21.61 | 178.4 | 15.5% |
| 2003 | 2.93 | 21.29 | 175.9 | 13.8% |
| 2002 | 3.41 | 21.22 | 175.6 | 16.1% |
| 2001 | 3.69 | 21.38 | 177.2 | 17.2% |
| 2000 | 3.72 | 21.56 | 179.1 | 17.3% |
| 1999 | 3.74 | 21.56 | 179.4 | 17.3% |
| 1998 | 3.91 | 21.09 | 175.8 | 18.5% |
| 1997 | 3.82 | 21.51 | 179.7 | 17.8% |
| 1996 | 3.64 | 21.19 | 177.4 | 17.2% |
| 1995 | 3.54 | 20.8 | 174.6 | 17% |
| 1994 | 3.27 | 20.23 | 170.3 | 16.1% |
| 1993 | 3.18 | 19.32 | 163.3 | 16.4% |
| 1992 | 2.9 | 19.14 | 162.3 | 15.1% |
| 1991 | 2.85 | 18.94 | 161.3 | 15.1% |
| 1990 | 2.71 | 18.55 | 158.6 | 14.6% |
| 1989 | 2.7 | 17.5 | 150.2 | 15.4% |
| 1988 | 2.71 | 16.98 | 146.3 | 15.9% |
| 1987 | 2.85 | 16.06 | 139 | 17.7% |
| 1986 | 2.62 | 15.6 | 135.7 | 16.8% |
| 1985 | 2.53 | 15.48 | 135.2 | 16.3% |
| 1984 | 2.25 | 15.52 | 136 | 14.5% |
| 1983 | 2.04 | 14.45 | 127.1 | 14.1% |
| 1982 | 1.92 | 14.69 | 129.8 | 13% |
| 1981 | 1.73 | 15.17 | 134.5 | 11.4% |
| 1980 | 1.7 | 15.19 | 135.4 | 11.2% |