
| 2024 | 0.01 | 0.02 | 19.13 | 50.8% |
| 2023 | 0.0097 | 0.02 | 19.06 | 41.2% |
| 2022 | 0.0084 | 0.02 | 17.49 | 39.2% |
| 2021 | 0.0055 | 0.02 | 18.83 | 24.1% |
| 2020 | 0.0054 | 0.02 | 19.58 | 23.3% |
| 2019 | 0.0053 | 0.02 | 19.95 | 22.6% |
| 2018 | 0.0058 | 0.02 | 18.64 | 26.6% |
| 2017 | 0.0066 | 0.02 | 17.95 | 32% |
| 2016 | 0.0071 | 0.02 | 17.44 | 35.2% |
| 2015 | 0.0067 | 0.02 | 16.85 | 35% |
| 2014 | 0.0071 | 0.02 | 16.49 | 38.1% |
| 2013 | 0.0074 | 0.02 | 16.03 | 41.1% |
| 2012 | 0.0077 | 0.02 | 16.69 | 41% |
| 2011 | 0.0077 | 0.02 | 17.38 | 39.7% |
| 2010 | 0.0095 | 0.02 | 19.04 | 44.7% |
| 2009 | 0.01 | 0.02 | 19.83 | 57.2% |
| 2008 | 0.02 | 0.02 | 21.12 | 69.5% |
| 2007 | 0.02 | 0.02 | 21.86 | 69.5% |
| 2006 | 0.02 | 0.02 | 21.34 | 69.7% |
| 2005 | 0.02 | 0.02 | 20.27 | 71.2% |
| 2004 | 0.02 | 0.02 | 20.19 | 75.3% |
| 2003 | 0.02 | 0.02 | 21.24 | 70.2% |
| 2002 | 0.02 | 0.02 | 22.48 | 65.5% |
| 2001 | 0.01 | 0.02 | 22.42 | 56.1% |
| 2000 | 0.01 | 0.02 | 22.21 | 62% |
| 1999 | 0.0092 | 0.02 | 16.57 | 53.7% |
| 1998 | 0.0087 | 0.02 | 16.38 | 52.3% |
| 1997 | 0.0057 | 0.01 | 13.12 | 42.8% |
| 1996 | 0.0037 | 0.01 | 12.93 | 29.3% |
| 1995 | 0.0048 | 0.01 | 13.87 | 35.4% |
| 1994 | 0.0048 | 0.01 | 14.23 | 34.6% |
| 1993 | 0.002 | 0.01 | 10.66 | 19.4% |
| 1992 | 0.003 | 0.01 | 11.01 | 29.1% |
| 1991 | 0.0036 | 0.01 | 11.69 | 33.8% |
| 1990 | 0.0043 | 0.01 | 12.27 | 40% |
| 1989 | 0.0043 | 0.01 | 12.66 | 40.9% |
| 1988 | 0.0041 | 0.01 | 12.45 | 41.2% |
| 1987 | 0.0045 | 0.0099 | 12.96 | 45.6% |
| 1986 | 0.0046 | 0.009 | 12.29 | 50.6% |
| 1985 | 0.0045 | 0.0092 | 13.02 | 49.4% |
| 1984 | 0.0034 | 0.0074 | 10.93 | 45.4% |
| 1983 | 0.0026 | 0.0067 | 10.13 | 39.3% |
| 1982 | 0.0035 | 0.0075 | 11.76 | 46% |
| 1981 | 0.0043 | 0.0084 | 13.54 | 51.5% |
| 1980 | 0.0046 | 0.0086 | 14.47 | 53% |