
| 2024 | 2.12 | 12.42 | 240.1 | 17.1% |
| 2023 | 1.94 | 12.08 | 233.5 | 16% |
| 2022 | 1.87 | 12.09 | 233.4 | 15.5% |
| 2021 | 1.68 | 12.09 | 233.2 | 13.9% |
| 2020 | 1.69 | 11.56 | 222.9 | 14.6% |
| 2019 | 1.56 | 11.96 | 230.9 | 13% |
| 2018 | 1.44 | 12.18 | 235.8 | 11.8% |
| 2017 | 1.56 | 12.05 | 234.1 | 12.9% |
| 2016 | 1.67 | 11.94 | 232.8 | 14% |
| 2015 | 1.67 | 11.6 | 227.4 | 14.4% |
| 2014 | 1.59 | 11.29 | 223.3 | 14% |
| 2013 | 1.43 | 11.22 | 224.1 | 12.7% |
| 2012 | 1.54 | 11.17 | 225.3 | 13.7% |
| 2011 | 1.59 | 10.97 | 223.3 | 14.5% |
| 2010 | 1.52 | 10.56 | 216.5 | 14.4% |
| 2009 | 1.52 | 9.83 | 202.6 | 15.4% |
| 2008 | 1.54 | 9.88 | 204.2 | 15.6% |
| 2007 | 1.47 | 9.71 | 201.5 | 15.1% |
| 2006 | 1.51 | 9.37 | 195.1 | 16.1% |
| 2005 | 1.47 | 9.2 | 192.3 | 16% |
| 2004 | 1.34 | 8.9 | 186.6 | 15% |
| 2003 | 1.33 | 8.72 | 183.5 | 15.3% |
| 2002 | 1.23 | 8.4 | 177.6 | 14.6% |
| 2001 | 1.18 | 8.29 | 176.1 | 14.2% |
| 2000 | 1.16 | 8.07 | 172.5 | 14.4% |
| 1999 | 1.1 | 7.51 | 161.5 | 14.7% |
| 1998 | 0.98 | 6.84 | 148 | 14.3% |
| 1997 | 0.86 | 7.44 | 161.9 | 11.5% |
| 1996 | 0.84 | 6.9 | 151.3 | 12.2% |
| 1995 | 0.8 | 6.38 | 140.7 | 12.5% |
| 1994 | 0.76 | 5.86 | 129.7 | 13% |
| 1993 | 0.82 | 5.45 | 121.3 | 15% |
| 1992 | 0.86 | 5.02 | 112.5 | 17.2% |
| 1991 | 0.94 | 4.51 | 101.4 | 20.9% |
| 1990 | 0.97 | 4.03 | 91.46 | 24.1% |
| 1989 | 1.02 | 3.61 | 82.87 | 28.2% |
| 1988 | 1.03 | 3.36 | 78.25 | 30.7% |
| 1987 | 1.03 | 3.01 | 71.06 | 34.2% |
| 1986 | 0.92 | 2.65 | 63.55 | 34.6% |
| 1985 | 0.76 | 2.38 | 57.77 | 32% |
| 1984 | 0.68 | 2.24 | 55.08 | 30.4% |
| 1983 | 0.61 | 2.14 | 53.42 | 28.7% |
| 1982 | 0.56 | 2 | 50.71 | 28.2% |
| 1981 | 0.55 | 1.95 | 50.5 | 28.2% |
| 1980 | 0.52 | 1.87 | 49.02 | 27.9% |