
| 2024 | 0.73 | 3.22 | 176.9 | 22.8% |
| 2023 | 0.8 | 3.27 | 180.7 | 24.5% |
| 2022 | 0.97 | 3.27 | 182.6 | 29.8% |
| 2021 | 1.08 | 3.68 | 207.6 | 29.3% |
| 2020 | 1.12 | 3.57 | 202.6 | 31.4% |
| 2019 | 1.32 | 3.8 | 216.9 | 34.8% |
| 2018 | 1.47 | 3.74 | 214.8 | 39.3% |
| 2017 | 1.67 | 3.83 | 221.4 | 43.7% |
| 2016 | 1.88 | 3.78 | 219.9 | 49.7% |
| 2015 | 1.97 | 3.73 | 218.2 | 52.7% |
| 2014 | 2.47 | 3.72 | 218.7 | 66.4% |
| 2013 | 2.97 | 3.91 | 230.6 | 75.8% |
| 2012 | 2.78 | 4 | 236.8 | 69.4% |
| 2011 | 2.77 | 4.08 | 241.9 | 68.1% |
| 2010 | 3.01 | 4.27 | 254.4 | 70.5% |
| 2009 | 2.7 | 4.07 | 243.8 | 66.4% |
| 2008 | 2.85 | 4.22 | 254.5 | 67.6% |
| 2007 | 2.62 | 4.27 | 258.3 | 61.3% |
| 2006 | 2.63 | 4.28 | 259.5 | 61.6% |
| 2005 | 2.69 | 4.29 | 260.7 | 62.6% |
| 2004 | 2.93 | 4.27 | 260.1 | 68.5% |
| 2003 | 2.51 | 4.18 | 255.1 | 60.2% |
| 2002 | 2.6 | 4.11 | 252.1 | 63.4% |
| 2001 | 2.64 | 4.06 | 250.8 | 65% |
| 2000 | 2.47 | 3.94 | 245.6 | 62.6% |
| 1999 | 2.56 | 3.87 | 242.9 | 66% |
| 1998 | 2.74 | 3.9 | 246.6 | 70.2% |
| 1997 | 2.86 | 3.89 | 247.3 | 73.5% |
| 1996 | 3.23 | 3.95 | 252.4 | 81.8% |
| 1995 | 2.89 | 3.75 | 241 | 77% |
| 1994 | 2.88 | 3.65 | 235.6 | 79% |
| 1993 | 2.97 | 3.62 | 235 | 82.2% |
| 1992 | 2.93 | 3.54 | 232 | 82.5% |
| 1991 | 2.92 | 3.58 | 236.2 | 81.6% |
| 1990 | 2.62 | 3.41 | 227 | 76.8% |
| 1989 | 2.6 | 3.27 | 219.1 | 79.6% |
| 1988 | 2.4 | 3.25 | 219 | 74% |
| 1987 | 2.71 | 3.24 | 219.8 | 83.6% |
| 1986 | 2.72 | 3.14 | 215 | 86.4% |
| 1985 | 2.89 | 3 | 206.3 | 96.5% |
| 1984 | 2.74 | 2.88 | 198.9 | 95.4% |
| 1983 | 2.59 | 2.86 | 198.7 | 90.6% |
| 1982 | 2.44 | 2.98 | 208.2 | 81.9% |
| 1981 | 2.87 | 3.07 | 215.2 | 93.4% |
| 1980 | 3.09 | 3.27 | 230.6 | 94.6% |