
| 2024 | 6.64 | 1.92 | 388.1 | 346.7% |
| 2023 | 6.87 | 1.86 | 383.9 | 369.8% |
| 2022 | 7.04 | 1.78 | 388.3 | 395.1% |
| 2021 | 6.35 | 1.68 | 385.6 | 377.4% |
| 2020 | 6.42 | 1.58 | 358.4 | 407.3% |
| 2019 | 7.05 | 1.78 | 401.2 | 395.6% |
| 2018 | 7.15 | 1.79 | 413.9 | 399.8% |
| 2017 | 7.04 | 1.66 | 399.7 | 424% |
| 2016 | 7.37 | 1.72 | 428.4 | 429.7% |
| 2015 | 7.12 | 1.68 | 439.4 | 422.4% |
| 2014 | 6.68 | 1.59 | 433.9 | 419.9% |
| 2013 | 6.74 | 1.55 | 442.9 | 434.1% |
| 2012 | 6.59 | 1.56 | 468.2 | 421.8% |
| 2011 | 6.26 | 1.48 | 471.7 | 423.3% |
| 2010 | 5.63 | 1.4 | 476.4 | 401.9% |
| 2009 | 5.73 | 1.42 | 508.7 | 402.8% |
| 2008 | 6.29 | 1.33 | 500.2 | 474.5% |
| 2007 | 5.91 | 1.24 | 492.7 | 478.6% |
| 2006 | 6.05 | 1.16 | 491.6 | 520.5% |
| 2005 | 5.88 | 1.17 | 523.5 | 502.4% |
| 2004 | 5.63 | 1 | 464.9 | 561.4% |
| 2003 | 5.22 | 0.96 | 456.9 | 541.6% |
| 2002 | 3.95 | 0.89 | 431.7 | 443.9% |
| 2001 | 4.21 | 0.84 | 419.3 | 500.1% |
| 2000 | 4.36 | 0.82 | 421.8 | 528.2% |
| 1999 | 4.07 | 0.92 | 483.1 | 443.1% |
| 1998 | 4.42 | 0.85 | 458.4 | 523.1% |
| 1997 | 4.49 | 0.8 | 446.8 | 561.8% |
| 1996 | 4.3 | 0.63 | 361.5 | 686.9% |
| 1995 | 4.34 | 0.59 | 350.6 | 736.1% |
| 1994 | 4.32 | 0.57 | 343.1 | 756.3% |
| 1993 | 3.96 | 0.48 | 284.2 | 834.3% |
| 1992 | 2.06 | 0.35 | 214.2 | 588.7% |
| 1991 | 0.29 | 0.22 | 159.3 | 135.5% |
| 1990 | 2.5 | 0.41 | 241.7 | 614.8% |
| 1989 | 3.84 | 0.69 | 313 | 552.9% |
| 1988 | 3.17 | 0.62 | 290.8 | 510.5% |
| 1987 | 2.81 | 0.54 | 261.4 | 523.9% |
| 1986 | 3.04 | 0.45 | 229.1 | 672.7% |
| 1985 | 2.11 | 0.4 | 213.3 | 522.3% |
| 1984 | 2.26 | 0.41 | 223.5 | 556.5% |
| 1983 | 0.13 | 0.39 | 224.5 | 33.2% |
| 1982 | 0.1 | 0.36 | 214 | 29.4% |
| 1981 | 0.1 | 0.35 | 222 | 29.8% |
| 1980 | 0.26 | 0.48 | 320.1 | 53% |