
| 2024 | 4.81 | 1.76 | 7.55 | 273.7% |
| 2023 | 4.63 | 1.71 | 7.49 | 271.2% |
| 2022 | 4.46 | 1.8 | 8.06 | 248.1% |
| 2021 | 5.07 | 1.78 | 8.15 | 284.8% |
| 2020 | 5.74 | 1.65 | 7.7 | 348.6% |
| 2019 | 6.07 | 1.75 | 8.35 | 347% |
| 2018 | 5.97 | 1.67 | 8.13 | 357.9% |
| 2017 | 5.99 | 1.56 | 7.8 | 383.4% |
| 2016 | 5.74 | 1.61 | 8.26 | 355.7% |
| 2015 | 6.49 | 1.6 | 8.39 | 405.6% |
| 2014 | 6.82 | 1.69 | 9.07 | 404.4% |
| 2013 | 6.53 | 1.55 | 8.54 | 422.3% |
| 2012 | 7.01 | 1.19 | 6.78 | 586.8% |
| 2011 | 6.97 | 1.18 | 6.9 | 589.5% |
| 2010 | 6.37 | 0.82 | 4.93 | 775.4% |
| 2009 | 5.74 | 0.67 | 4.13 | 856.9% |
| 2008 | 5.92 | 1.06 | 6.72 | 559.6% |
| 2007 | 5.97 | 0.86 | 5.61 | 695.1% |
| 2006 | 6.08 | 0.94 | 6.27 | 649.9% |
| 2005 | 6.16 | 1.04 | 7.17 | 592.4% |
| 2004 | 5.99 | 0.94 | 6.69 | 634.7% |
| 2003 | 5.53 | 0.91 | 6.64 | 606.5% |
| 2002 | 4.78 | 0.86 | 6.42 | 558.1% |
| 2001 | 5.05 | 0.83 | 6.42 | 605.6% |
| 2000 | 4.88 | 0.73 | 5.81 | 663.5% |
| 1999 | 4.45 | 0.77 | 6.3 | 575% |
| 1998 | 4.78 | 0.77 | 6.46 | 616.8% |
| 1997 | 5.13 | 0.81 | 6.94 | 633.4% |
| 1996 | 4.84 | 0.81 | 7.12 | 597.5% |
| 1995 | 4.36 | 0.79 | 7.13 | 551.8% |
| 1994 | 4.27 | 0.71 | 6.54 | 604.3% |
| 1993 | 4.3 | 0.76 | 7.23 | 566.6% |
| 1992 | 4.25 | 0.74 | 7.27 | 571.7% |
| 1991 | 4.11 | 0.73 | 7.27 | 566.1% |
| 1990 | 3.91 | 0.67 | 6.87 | 586.2% |
| 1989 | 3.74 | 0.69 | 7.29 | 543.5% |
| 1988 | 3.16 | 0.64 | 6.91 | 497.4% |
| 1987 | 2.93 | 0.6 | 6.65 | 491.3% |
| 1986 | 3.28 | 0.56 | 6.42 | 586.5% |
| 1985 | 3.34 | 0.58 | 6.8 | 578.6% |
| 1984 | 3.1 | 0.54 | 6.56 | 572.4% |
| 1983 | 0.09 | 0.51 | 6.28 | 18.6% |
| 1982 | 0.06 | 0.5 | 6.4 | 12.7% |
| 1981 | 0.09 | 0.5 | 6.55 | 18.1% |
| 1980 | 0.05 | 0.4 | 5.41 | 13.1% |