
| 2024 | 22.64 | 12.68 | 319 | 178.6% |
| 2023 | 22.01 | 12.54 | 319 | 175.5% |
| 2022 | 21.56 | 12.33 | 317.7 | 174.8% |
| 2021 | 20.83 | 11.88 | 309 | 175.3% |
| 2020 | 20.17 | 11.84 | 310.1 | 170.4% |
| 2019 | 20.93 | 12.74 | 337.3 | 164.3% |
| 2018 | 21.23 | 12.86 | 344.7 | 165.1% |
| 2017 | 20.23 | 12.6 | 342.4 | 160.5% |
| 2016 | 18.71 | 12.21 | 335.8 | 153.3% |
| 2015 | 18.51 | 12.35 | 343.3 | 149.9% |
| 2014 | 18.3 | 12.4 | 347.9 | 147.6% |
| 2013 | 17.44 | 12.24 | 346.9 | 142.5% |
| 2012 | 16.71 | 11.95 | 342.1 | 139.9% |
| 2011 | 16.25 | 11.71 | 338.9 | 138.8% |
| 2010 | 15.97 | 11.53 | 337.1 | 138.5% |
| 2009 | 15.82 | 10.93 | 323.2 | 144.8% |
| 2008 | 16.46 | 11.1 | 331.9 | 148.2% |
| 2007 | 15.56 | 11.43 | 345.3 | 136.2% |
| 2006 | 15.48 | 11.59 | 353.6 | 133.6% |
| 2005 | 15.31 | 11.38 | 350.8 | 134.6% |
| 2004 | 15.03 | 11.3 | 351.6 | 133% |
| 2003 | 14.75 | 10.98 | 345 | 134.3% |
| 2002 | 14.91 | 10.62 | 336.8 | 140.4% |
| 2001 | 14.83 | 10.4 | 333.2 | 142.6% |
| 2000 | 14.74 | 10.15 | 328.7 | 145.2% |
| 1999 | 14.34 | 10.25 | 335 | 139.9% |
| 1998 | 14.23 | 9.71 | 320.3 | 146.5% |
| 1997 | 14.14 | 9.88 | 328.6 | 143.1% |
| 1996 | 13.95 | 9.79 | 329 | 142.4% |
| 1995 | 13.65 | 9.55 | 324.1 | 142.9% |
| 1994 | 13.26 | 9.42 | 323.2 | 140.7% |
| 1993 | 12.38 | 9.15 | 317.2 | 135.3% |
| 1992 | 11.54 | 8.9 | 312.4 | 129.7% |
| 1991 | 11.08 | 8.63 | 306.6 | 128.3% |
| 1990 | 10.65 | 8.66 | 311.5 | 123% |
| 1989 | 10.62 | 8.9 | 325.1 | 119.4% |
| 1988 | 10.65 | 8.68 | 322.2 | 122.8% |
| 1987 | 9.79 | 8.14 | 306.6 | 120.3% |
| 1986 | 9.16 | 7.87 | 300.2 | 116.4% |
| 1985 | 9.35 | 7.81 | 301.3 | 119.7% |
| 1984 | 8.89 | 7.58 | 295.2 | 117.3% |
| 1983 | 5 | 7.13 | 280.6 | 70.2% |
| 1982 | 5 | 7.29 | 289.9 | 68.6% |
| 1981 | 4.91 | 7.63 | 306.9 | 64.3% |
| 1980 | 4.87 | 7.84 | 319.4 | 62.2% |