
| 2024 | 6.47 | 2.89 | 61.69 | 224% |
| 2023 | 6.83 | 2.84 | 61.44 | 240.9% |
| 2022 | 6.74 | 2.77 | 60.87 | 243.6% |
| 2021 | 6.75 | 2.65 | 59.24 | 254.6% |
| 2020 | 5.98 | 2.47 | 56.11 | 242.2% |
| 2019 | 6.47 | 2.61 | 60.34 | 247.7% |
| 2018 | 6.75 | 2.5 | 58.86 | 269.8% |
| 2017 | 6.83 | 2.36 | 56.66 | 289% |
| 2016 | 6.91 | 2.33 | 57.14 | 296% |
| 2015 | 6.69 | 2.35 | 58.74 | 284.8% |
| 2014 | 6.56 | 2.3 | 58.62 | 285.4% |
| 2013 | 6.51 | 2.04 | 52.99 | 319.7% |
| 2012 | 7 | 2.09 | 55.63 | 334% |
| 2011 | 6.83 | 1.93 | 52.43 | 352.8% |
| 2010 | 6.93 | 1.78 | 49.1 | 389.9% |
| 2009 | 6.94 | 1.78 | 50.22 | 389.6% |
| 2008 | 7.18 | 1.68 | 48.13 | 428.3% |
| 2007 | 7.07 | 1.55 | 45.29 | 456.9% |
| 2006 | 7.32 | 1.56 | 46.35 | 469.5% |
| 2005 | 7.42 | 1.49 | 44.91 | 499% |
| 2004 | 6.92 | 1.29 | 39.65 | 535% |
| 2003 | 6.79 | 1.32 | 41.07 | 514% |
| 2002 | 6.33 | 1.31 | 41.17 | 484.6% |
| 2001 | 6.09 | 1.28 | 40.7 | 477.4% |
| 2000 | 6.12 | 1.27 | 41.22 | 480.6% |
| 1999 | 5.93 | 1.24 | 40.85 | 476.1% |
| 1998 | 5.73 | 1.25 | 41.57 | 458.8% |
| 1997 | 5.54 | 1.2 | 40.68 | 460.6% |
| 1996 | 5.21 | 1.26 | 43.49 | 412.8% |
| 1995 | 4.97 | 1.29 | 45.24 | 385.7% |
| 1994 | 4.65 | 1.23 | 44.18 | 377.2% |
| 1993 | 4.8 | 1.19 | 43.8 | 402.1% |
| 1992 | 4.9 | 1.3 | 48.84 | 377% |
| 1991 | 4.86 | 1.35 | 52.02 | 359.7% |
| 1990 | 4.72 | 1.22 | 47.95 | 388% |
| 1989 | 4.51 | 1.17 | 47.4 | 384.3% |
| 1988 | 4.37 | 1.21 | 50.27 | 360.8% |
| 1987 | 4.21 | 1.13 | 48.41 | 371.2% |
| 1986 | 3.94 | 1.06 | 46.8 | 370.3% |
| 1985 | 3.81 | 1.04 | 47.34 | 366% |
| 1984 | 3.7 | 1.13 | 52.99 | 328.6% |
| 1983 | 1.55 | 1.07 | 51.99 | 145.2% |
| 1982 | 1.11 | 0.95 | 47.75 | 117.4% |
| 1981 | 0.91 | 0.66 | 34.38 | 138.1% |
| 1980 | 0.49 | 0.78 | 41.86 | 62.4% |