
| 2024 | 0.11 | 0.17 | 8.16 | 61.2% |
| 2023 | 0.11 | 0.17 | 8.39 | 62.3% |
| 2022 | 0.08 | 0.14 | 6.78 | 57.7% |
| 2021 | 0.08 | 0.14 | 7.19 | 59% |
| 2020 | 0.07 | 0.13 | 6.89 | 55% |
| 2019 | 0.07 | 0.12 | 6.7 | 54.6% |
| 2018 | 0.08 | 0.13 | 7.06 | 60.1% |
| 2017 | 0.06 | 0.12 | 6.68 | 54% |
| 2016 | 0.05 | 0.1 | 5.9 | 46.5% |
| 2015 | 0.05 | 0.1 | 5.91 | 50.8% |
| 2014 | 0.05 | 0.09 | 5.92 | 55.7% |
| 2013 | 0.05 | 0.09 | 5.55 | 57.3% |
| 2012 | 0.04 | 0.08 | 5.5 | 54.1% |
| 2011 | 0.04 | 0.07 | 5.13 | 52.9% |
| 2010 | 0.04 | 0.06 | 4.61 | 55.3% |
| 2009 | 0.03 | 0.06 | 4.59 | 54.4% |
| 2008 | 0.03 | 0.06 | 4.72 | 53% |
| 2007 | 0.03 | 0.06 | 4.49 | 58.9% |
| 2006 | 0.03 | 0.06 | 5.14 | 55.4% |
| 2005 | 0.03 | 0.06 | 5.25 | 55.3% |
| 2004 | 0.03 | 0.06 | 5.14 | 58.4% |
| 2003 | 0.03 | 0.06 | 5.11 | 58.9% |
| 2002 | 0.03 | 0.05 | 4.98 | 61.2% |
| 2001 | 0.03 | 0.05 | 4.84 | 65.2% |
| 2000 | 0.03 | 0.05 | 4.7 | 67.4% |
| 1999 | 0.03 | 0.05 | 4.83 | 70.4% |
| 1998 | 0.03 | 0.05 | 5.43 | 64.9% |
| 1997 | 0.03 | 0.05 | 5.55 | 65% |
| 1996 | 0.03 | 0.05 | 5.29 | 63.9% |
| 1995 | 0.03 | 0.05 | 5.42 | 71.4% |
| 1994 | 0.04 | 0.05 | 6.13 | 74.8% |
| 1993 | 0.04 | 0.05 | 6.35 | 77.8% |
| 1992 | 0.04 | 0.06 | 7.08 | 67.1% |
| 1991 | 0.04 | 0.05 | 6.76 | 71.5% |
| 1990 | 0.04 | 0.06 | 7.5 | 64.3% |
| 1989 | 0.03 | 0.06 | 7.58 | 57.2% |
| 1988 | 0.04 | 0.06 | 8.7 | 63.9% |
| 1987 | 0.04 | 0.06 | 8.44 | 65.6% |
| 1986 | 0.05 | 0.06 | 8.65 | 77.1% |
| 1985 | 0.05 | 0.06 | 8.84 | 76.9% |
| 1984 | 0.05 | 0.06 | 9.38 | 74.5% |
| 1983 | 0.04 | 0.06 | 10.07 | 70% |
| 1982 | 0.05 | 0.07 | 10.61 | 74.2% |
| 1981 | 0.05 | 0.06 | 10.76 | 70.6% |
| 1980 | 0.04 | 0.07 | 12.11 | 63.6% |