
| 2024 | 0.1 | 0.29 | 26.18 | 36.4% |
| 2023 | 0.11 | 0.29 | 26.06 | 38.1% |
| 2022 | 0.11 | 0.32 | 28.71 | 34.3% |
| 2021 | 0.12 | 0.32 | 28.37 | 36.5% |
| 2020 | 0.12 | 0.32 | 28.51 | 38.6% |
| 2019 | 0.13 | 0.35 | 30.83 | 37.1% |
| 2018 | 0.14 | 0.38 | 33.57 | 37% |
| 2017 | 0.15 | 0.36 | 32.09 | 40.5% |
| 2016 | 0.16 | 0.34 | 30.11 | 46.8% |
| 2015 | 0.17 | 0.44 | 38.61 | 38.7% |
| 2014 | 0.17 | 0.43 | 38.45 | 40.2% |
| 2013 | 0.17 | 0.43 | 37.71 | 40% |
| 2012 | 0.17 | 0.44 | 39.28 | 38.4% |
| 2011 | 0.17 | 0.41 | 36.1 | 42% |
| 2010 | 0.17 | 0.45 | 40.22 | 38% |
| 2009 | 0.17 | 0.4 | 35.37 | 41.5% |
| 2008 | 0.17 | 0.4 | 35.12 | 42.7% |
| 2007 | 0.15 | 0.35 | 30.72 | 41.8% |
| 2006 | 0.14 | 0.34 | 30.45 | 40.4% |
| 2005 | 0.14 | 0.35 | 31.3 | 39.5% |
| 2004 | 0.16 | 0.36 | 31.87 | 43.7% |
| 2003 | 0.17 | 0.35 | 31.53 | 49.3% |
| 2002 | 0.18 | 0.35 | 31.17 | 51.2% |
| 2001 | 0.15 | 0.34 | 30.91 | 43.6% |
| 2000 | 0.15 | 0.37 | 33.66 | 41% |
| 1999 | 0.12 | 0.39 | 34.92 | 30.4% |
| 1998 | 0.09 | 0.45 | 40.51 | 21.1% |
| 1997 | 0.1 | 0.47 | 42.7 | 21.1% |
| 1996 | 0.07 | 0.43 | 38.94 | 17.3% |
| 1995 | 0.07 | 0.41 | 37.9 | 17.1% |
| 1994 | 0.07 | 0.41 | 37.33 | 16.2% |
| 1993 | 0.06 | 0.4 | 37.06 | 14.7% |
| 1992 | 0.05 | 0.41 | 38.11 | 13.4% |
| 1991 | 0.04 | 0.46 | 43.1 | 8.2% |
| 1990 | 0.05 | 0.5 | 46.69 | 9.5% |
| 1989 | 0.04 | 0.51 | 48.15 | 8.7% |
| 1988 | 0.04 | 0.5 | 47.68 | 8.8% |
| 1987 | 0.05 | 0.49 | 47.46 | 10.2% |
| 1986 | 0.05 | 0.5 | 48.61 | 10.4% |
| 1985 | 0.05 | 0.49 | 47.77 | 9.4% |
| 1984 | 0.04 | 0.48 | 47.36 | 9.1% |
| 1983 | 0.01 | 0.46 | 46.09 | 2.4% |
| 1982 | 0.01 | 0.5 | 50.48 | 2.2% |
| 1981 | 0.0099 | 0.46 | 46.92 | 2.1% |
| 1980 | 0.01 | 0.45 | 46.35 | 2.3% |