
| 2024 | 0.07 | 0.09 | 31.28 | 74.7% |
| 2023 | 0.07 | 0.08 | 29.59 | 86.7% |
| 2022 | 0.07 | 0.09 | 31.22 | 75.3% |
| 2021 | 0.07 | 0.09 | 30.52 | 82.6% |
| 2020 | 0.06 | 0.07 | 25.09 | 84.8% |
| 2019 | 0.06 | 0.08 | 29.45 | 74.2% |
| 2018 | 0.07 | 0.1 | 33 | 71.6% |
| 2017 | 0.06 | 0.1 | 34.48 | 56.8% |
| 2016 | 0.07 | 0.09 | 31.51 | 79% |
| 2015 | 0.07 | 0.08 | 28.3 | 90.8% |
| 2014 | 0.07 | 0.09 | 30.26 | 82.7% |
| 2013 | 0.07 | 0.09 | 30.93 | 81% |
| 2012 | 0.06 | 0.08 | 26.37 | 76% |
| 2011 | 0.05 | 0.08 | 28.09 | 62.8% |
| 2010 | 0.06 | 0.08 | 25.87 | 74.1% |
| 2009 | 0.04 | 0.08 | 27.76 | 51% |
| 2008 | 0.04 | 0.08 | 27.24 | 46% |
| 2007 | 0.03 | 0.08 | 26.12 | 42.1% |
| 2006 | 0.04 | 0.08 | 26.31 | 48.7% |
| 2005 | 0.04 | 0.08 | 27.45 | 42.4% |
| 2004 | 0.04 | 0.09 | 27.54 | 42.5% |
| 2003 | 0.03 | 0.08 | 25.39 | 41.6% |
| 2002 | 0.03 | 0.08 | 24.61 | 38.2% |
| 2001 | 0.03 | 0.07 | 21.78 | 38.3% |
| 2000 | 0.03 | 0.07 | 21.21 | 44.8% |
| 1999 | 0.03 | 0.04 | 12.49 | 85.2% |
| 1998 | 0.04 | 0.05 | 15.82 | 69.7% |
| 1997 | 0.03 | 0.04 | 13.65 | 78.3% |
| 1996 | 0.04 | 0.05 | 14.19 | 91.8% |
| 1995 | 0.04 | 0.05 | 14.99 | 75.3% |
| 1994 | 0.04 | 0.04 | 13.58 | 86.6% |
| 1993 | 0.04 | 0.05 | 15.62 | 77.4% |
| 1992 | 0.05 | 0.06 | 18.92 | 73.6% |
| 1991 | 0.07 | 0.07 | 21.89 | 90.7% |
| 1990 | 0.08 | 0.1 | 29.02 | 88.7% |
| 1989 | 0.13 | 0.13 | 40.9 | 96.6% |
| 1988 | 0.13 | 0.14 | 44.49 | 89.9% |
| 1987 | 0.14 | 0.14 | 44.07 | 102.5% |
| 1986 | 0.15 | 0.14 | 46.12 | 105.3% |
| 1985 | 0.16 | 0.15 | 48.49 | 106.9% |
| 1984 | 0.17 | 0.15 | 49.79 | 112.4% |
| 1983 | 0.04 | 0.15 | 50.54 | 27% |
| 1982 | 0.04 | 0.14 | 49.55 | 26.1% |
| 1981 | 0.04 | 0.14 | 50.46 | 25.7% |
| 1980 | 0.03 | 0.14 | 52.14 | 23.6% |