
| 2024 | 0.06 | 0.18 | 53.91 | 34.6% |
| 2023 | 0.06 | 0.18 | 52.51 | 33.3% |
| 2022 | 0.06 | 0.17 | 50.53 | 36.3% |
| 2021 | 0.06 | 0.17 | 50.45 | 37.6% |
| 2020 | 0.06 | 0.16 | 45.65 | 39.6% |
| 2019 | 0.07 | 0.17 | 49.26 | 41.4% |
| 2018 | 0.06 | 0.16 | 47.11 | 40.5% |
| 2017 | 0.06 | 0.16 | 46.23 | 41.3% |
| 2016 | 0.06 | 0.17 | 49.63 | 36.8% |
| 2015 | 0.06 | 0.17 | 49.55 | 35.6% |
| 2014 | 0.06 | 0.16 | 47.17 | 35.2% |
| 2013 | 0.04 | 0.16 | 49.07 | 26.8% |
| 2012 | 0.03 | 0.17 | 51.55 | 19% |
| 2011 | 0.03 | 0.16 | 49.29 | 21% |
| 2010 | 0.04 | 0.15 | 46.32 | 26.3% |
| 2009 | 0.03 | 0.17 | 50.26 | 15.2% |
| 2008 | 0.02 | 0.16 | 49.18 | 14.7% |
| 2007 | 0.03 | 0.13 | 38.84 | 22.4% |
| 2006 | 0.01 | 0.13 | 39.1 | 9.8% |
| 2005 | 0.02 | 0.12 | 37.43 | 18.9% |
| 2004 | 0.02 | 0.12 | 37.55 | 13.5% |
| 2003 | 0.03 | 0.1 | 31.62 | 28.4% |
| 2002 | 0.03 | 0.1 | 29.31 | 34.3% |
| 2001 | 0.03 | 0.12 | 35.49 | 27.3% |
| 2000 | 0.02 | 0.12 | 35.78 | 20.9% |
| 1999 | 0.02 | 0.12 | 37.33 | 15.7% |
| 1998 | 0.03 | 0.12 | 35.6 | 27.2% |
| 1997 | 0.02 | 0.1 | 30.27 | 22.8% |
| 1996 | 0.02 | 0.09 | 27.94 | 22.2% |
| 1995 | 0.02 | 0.08 | 26.19 | 24.2% |
| 1994 | 0.03 | 0.09 | 27.81 | 29.3% |
| 1993 | 0.03 | 0.09 | 28.87 | 27.7% |
| 1992 | 0.03 | 0.08 | 26.59 | 32.9% |
| 1991 | 0.02 | 0.08 | 24.63 | 27.6% |
| 1990 | 0.02 | 0.09 | 27.72 | 28.2% |
| 1989 | 0.01 | 0.08 | 25.07 | 17% |
| 1988 | 0.02 | 0.08 | 26.99 | 22.1% |
| 1987 | 0.02 | 0.07 | 23.31 | 34.5% |
| 1986 | 0.02 | 0.06 | 20.81 | 39% |
| 1985 | 0.02 | 0.06 | 20.93 | 34.5% |
| 1984 | 0.02 | 0.07 | 22.59 | 35.4% |
| 1983 | 0.02 | 0.07 | 23.03 | 35.3% |
| 1982 | 0.0083 | 0.08 | 26.86 | 10.3% |
| 1981 | 0.0086 | 0.08 | 28.53 | 10.2% |
| 1980 | 0.0077 | 0.09 | 31.27 | 8.3% |