
| 2024 | 3.74 | 1.55 | 293.7 | 241.2% |
| 2023 | 3.77 | 1.52 | 300.3 | 248.7% |
| 2022 | 3.75 | 1.43 | 303.3 | 261.3% |
| 2021 | 3.48 | 1.32 | 292.4 | 264.2% |
| 2020 | 3.33 | 1.22 | 268.7 | 274.2% |
| 2019 | 3.39 | 1.28 | 278.4 | 265.5% |
| 2018 | 3.39 | 1.33 | 289.5 | 254.9% |
| 2017 | 3.21 | 1.21 | 267.7 | 264.3% |
| 2016 | 3.26 | 1.15 | 262.7 | 282.7% |
| 2015 | 3.19 | 1.18 | 280.9 | 271% |
| 2014 | 3.14 | 1.17 | 293.2 | 267.6% |
| 2013 | 3.11 | 1.07 | 280 | 289.8% |
| 2012 | 3.06 | 1.07 | 302.3 | 285.1% |
| 2011 | 2.86 | 0.91 | 295 | 314.6% |
| 2010 | 2.83 | 0.89 | 321.7 | 319.2% |
| 2009 | 2.64 | 0.76 | 281.8 | 348.6% |
| 2008 | 2.5 | 0.76 | 290.1 | 327.8% |
| 2007 | 2.39 | 0.61 | 235.5 | 394.6% |
| 2006 | 2.46 | 0.59 | 233.1 | 419.7% |
| 2005 | 2.4 | 0.51 | 209.2 | 466.5% |
| 2004 | 2.32 | 0.4 | 166.5 | 579.4% |
| 2003 | 2.34 | 0.4 | 169.5 | 584.7% |
| 2002 | 2.48 | 0.41 | 177.2 | 599.2% |
| 2001 | 2.57 | 0.39 | 166.9 | 666.2% |
| 2000 | 2.39 | 0.37 | 160.6 | 653.1% |
| 1999 | 2.14 | 0.3 | 133.8 | 711.3% |
| 1998 | 2.19 | 0.35 | 155.2 | 633.8% |
| 1997 | 2.12 | 0.27 | 121.8 | 794.9% |
| 1996 | 2.06 | 0.23 | 106.7 | 894.6% |
| 1995 | 2.01 | 0.22 | 105.4 | 898.5% |
| 1994 | 1.91 | 0.24 | 113.7 | 805.2% |
| 1993 | 1.82 | 0.23 | 112.4 | 802.7% |
| 1992 | 1.73 | 0.2 | 104.9 | 848.5% |
| 1991 | 1.65 | 0.19 | 103.9 | 855.3% |
| 1990 | 1.57 | 0.18 | 103.7 | 857.2% |
| 1989 | 1.47 | 0.17 | 100.3 | 875.7% |
| 1988 | 1.41 | 0.13 | 81.94 | 1082.3% |
| 1987 | 1.33 | 0.14 | 92.5 | 958.2% |
| 1986 | 1.27 | 0.13 | 95.25 | 942.7% |
| 1985 | 1.12 | 0.12 | 90.34 | 932.4% |
| 1984 | 0.94 | 0.1 | 81.07 | 925.7% |
| 1983 | 0.05 | 0.1 | 82.03 | 55.1% |
| 1982 | 0.04 | 0.08 | 75.49 | 50.9% |
| 1981 | 0.03 | 0.07 | 65.99 | 49.5% |
| 1980 | 0.03 | 0.06 | 64.56 | 45.4% |