
| 2024 | 0.54 | 1 | 177.9 | 53.9% |
| 2023 | 0.56 | 1.03 | 183.8 | 54.6% |
| 2022 | 0.48 | 1.02 | 183.1 | 47% |
| 2021 | 0.47 | 1.04 | 188.4 | 44.8% |
| 2020 | 0.43 | 1.01 | 182.9 | 42.5% |
| 2019 | 0.43 | 1.1 | 199 | 39.5% |
| 2018 | 0.42 | 1.11 | 201.3 | 38% |
| 2017 | 0.41 | 1.09 | 198.6 | 37.7% |
| 2016 | 0.41 | 1.11 | 202 | 36.6% |
| 2015 | 0.42 | 1.08 | 196.8 | 38.9% |
| 2014 | 0.41 | 1.11 | 203.4 | 36.9% |
| 2013 | 0.41 | 1.15 | 211.3 | 35.5% |
| 2012 | 0.4 | 1.12 | 206.6 | 36.1% |
| 2011 | 0.39 | 1.16 | 214.4 | 33.9% |
| 2010 | 0.39 | 1.21 | 225.5 | 32.3% |
| 2009 | 0.37 | 1.13 | 211.3 | 33% |
| 2008 | 0.39 | 1.2 | 225.2 | 32.8% |
| 2007 | 0.38 | 1.25 | 235.7 | 30.5% |
| 2006 | 0.37 | 1.26 | 238.9 | 29.6% |
| 2005 | 0.37 | 1.17 | 223.9 | 31.7% |
| 2004 | 0.38 | 1.25 | 238.5 | 30.3% |
| 2003 | 0.35 | 1.26 | 241 | 27.9% |
| 2002 | 0.35 | 1.19 | 228.6 | 29.1% |
| 2001 | 0.35 | 1.16 | 223.8 | 30.4% |
| 2000 | 0.36 | 1.14 | 219.6 | 31.4% |
| 1999 | 0.36 | 1.13 | 219.4 | 31.3% |
| 1998 | 0.36 | 1.13 | 219.4 | 32% |
| 1997 | 0.32 | 1.1 | 213 | 29.2% |
| 1996 | 0.29 | 1.07 | 209.6 | 27.2% |
| 1995 | 0.3 | 1.05 | 205.7 | 28.4% |
| 1994 | 0.3 | 1.12 | 219.2 | 26.6% |
| 1993 | 0.3 | 1.05 | 207 | 28.8% |
| 1992 | 0.29 | 1.05 | 207.4 | 27.8% |
| 1991 | 0.29 | 1.05 | 210 | 27.3% |
| 1990 | 0.28 | 1.06 | 212 | 26.4% |
| 1989 | 0.23 | 0.99 | 199.5 | 23.3% |
| 1988 | 0.24 | 0.98 | 198 | 24.1% |
| 1987 | 0.24 | 0.98 | 198.6 | 24.4% |
| 1986 | 0.23 | 0.91 | 185.5 | 25% |
| 1985 | 0.23 | 0.88 | 180.3 | 25.8% |
| 1984 | 0.23 | 0.86 | 176.8 | 26.6% |
| 1983 | 0.22 | 0.82 | 168.2 | 26.8% |
| 1982 | 0.21 | 0.83 | 171.2 | 25.2% |
| 1981 | 0.19 | 0.85 | 176.3 | 22.4% |
| 1980 | 0.1 | 0.9 | 189.2 | 11.5% |