
| 2024 | 9.96 | 2.34 | 766.1 | 426.6% |
| 2023 | 9.95 | 2.39 | 803.7 | 415.7% |
| 2022 | 9.85 | 2.12 | 734 | 464.1% |
| 2021 | 9.76 | 2.13 | 756.5 | 458.5% |
| 2020 | 9.67 | 2.04 | 729 | 473.4% |
| 2019 | 9.65 | 2.13 | 761 | 453.4% |
| 2018 | 9.74 | 2.13 | 773 | 456.2% |
| 2017 | 9.77 | 2.05 | 757.3 | 476.8% |
| 2016 | 9.85 | 1.99 | 767.4 | 493.6% |
| 2015 | 9.78 | 2.06 | 847.8 | 475.4% |
| 2014 | 9.75 | 2.13 | 960.3 | 457.5% |
| 2013 | 10.06 | 2.08 | 1,022.9 | 483.9% |
| 2012 | 9.84 | 1.91 | 1,003.2 | 514.1% |
| 2011 | 9.17 | 1.37 | 758.7 | 667.7% |
| 2010 | 7.78 | 1.25 | 734.1 | 620.2% |
| 2009 | 6.34 | 1.2 | 757.6 | 527.6% |
| 2008 | 5.9 | 1.14 | 800 | 517.1% |
| 2007 | 5.07 | 1.05 | 871 | 481.7% |
| 2006 | 4.38 | 0.97 | 994.6 | 453.1% |
| 2005 | 4.07 | 0.89 | 1,076.8 | 458.1% |
| 2004 | 3.76 | 0.72 | 935.7 | 519.4% |
| 2003 | 3.22 | 0.63 | 849.7 | 508.6% |
| 2002 | 2.76 | 0.6 | 846.5 | 458.4% |
| 2001 | 2.7 | 0.5 | 741.8 | 536.1% |
| 2000 | 2.77 | 0.66 | 1,024.6 | 419% |
| 1999 | 2.33 | 0.62 | 1,008.3 | 377.3% |
| 1998 | 2.24 | 0.62 | 1,071 | 360.4% |
| 1997 | 2.07 | 0.61 | 1,107.9 | 339.6% |
| 1996 | 1.65 | 0.58 | 1,093.2 | 285.4% |
| 1995 | 1.55 | 0.56 | 1,093.5 | 275.1% |
| 1994 | 1.44 | 0.56 | 1,117.9 | 257.5% |
| 1993 | 1.46 | 0.56 | 1,149.1 | 261.4% |
| 1992 | 1.38 | 0.52 | 1,111 | 263.6% |
| 1991 | 1.17 | 0.34 | 737.8 | 347.9% |
| 1990 | 1.14 | 0.29 | 648.8 | 397.8% |
| 1989 | 1.08 | 0.28 | 653.1 | 387.4% |
| 1988 | 0.95 | 0.27 | 652.1 | 353.9% |
| 1987 | 0.88 | 0.26 | 659.9 | 335.4% |
| 1986 | 0.94 | 0.26 | 668.3 | 367.5% |
| 1985 | 0.89 | 0.25 | 678.6 | 359.6% |
| 1984 | 1.13 | 0.27 | 762.8 | 425.1% |
| 1983 | 0.18 | 0.22 | 681.6 | 81.1% |
| 1982 | 0.19 | 0.24 | 755.5 | 82.7% |
| 1981 | 0.16 | 0.2 | 678.5 | 82.5% |
| 1980 | 0.19 | 0.23 | 817.7 | 85.4% |