
| 2024 | 0.19 | 0.28 | 8.91 | 65% |
| 2023 | 0.18 | 0.29 | 9.18 | 61.5% |
| 2022 | 0.17 | 0.27 | 8.8 | 64.4% |
| 2021 | 0.17 | 0.23 | 7.64 | 74.6% |
| 2020 | 0.17 | 0.19 | 6.59 | 91.7% |
| 2019 | 0.18 | 0.2 | 6.95 | 90.7% |
| 2018 | 0.17 | 0.18 | 6.7 | 90.1% |
| 2017 | 0.17 | 0.18 | 6.85 | 93.6% |
| 2016 | 0.18 | 0.19 | 7.22 | 93.8% |
| 2015 | 0.14 | 0.16 | 6.52 | 86.4% |
| 2014 | 0.16 | 0.16 | 6.59 | 97.5% |
| 2013 | 0.16 | 0.15 | 6.44 | 102.5% |
| 2012 | 0.15 | 0.14 | 5.85 | 110.4% |
| 2011 | 0.15 | 0.11 | 4.8 | 135.4% |
| 2010 | 0.16 | 0.12 | 5.35 | 132.1% |
| 2009 | 0.19 | 0.11 | 5.19 | 165.4% |
| 2008 | 0.19 | 0.12 | 5.54 | 161.1% |
| 2007 | 0.16 | 0.11 | 5.13 | 151.7% |
| 2006 | 0.19 | 0.1 | 4.95 | 182.4% |
| 2005 | 0.14 | 0.12 | 6.04 | 114% |
| 2004 | 0.11 | 0.11 | 5.42 | 100.7% |
| 2003 | 0.1 | 0.1 | 5.06 | 102.1% |
| 2002 | 0.09 | 0.11 | 5.85 | 80% |
| 2001 | 0.07 | 0.11 | 6.16 | 61.6% |
| 2000 | 0.07 | 0.11 | 6.42 | 62.5% |
| 1999 | 0.08 | 0.11 | 6.56 | 68.2% |
| 1998 | 0.06 | 0.09 | 5.23 | 63.9% |
| 1997 | 0.06 | 0.08 | 5.17 | 70.8% |
| 1996 | 0.05 | 0.08 | 5.27 | 66.2% |
| 1995 | 0.02 | 0.07 | 4.6 | 33% |
| 1994 | 0.02 | 0.07 | 4.6 | 29% |
| 1993 | 0.02 | 0.06 | 4.66 | 26% |
| 1992 | 0.02 | 0.06 | 4.27 | 29.2% |
| 1991 | 0.0064 | 0.06 | 4.48 | 11.3% |
| 1990 | 0.0088 | 0.07 | 5.61 | 12.8% |
| 1989 | 0.0086 | 0.08 | 6.92 | 10.6% |
| 1988 | 0.03 | 0.08 | 7.2 | 31.8% |
| 1987 | 0.04 | 0.08 | 7.17 | 49.6% |
| 1986 | 0.04 | 0.07 | 6.74 | 63.9% |
| 1985 | 0.05 | 0.07 | 6.75 | 70.3% |
| 1984 | 0.04 | 0.06 | 6.48 | 71.1% |
| 1983 | 0.0036 | 0.07 | 7.21 | 5.4% |
| 1982 | 0.0059 | 0.06 | 7.28 | 9.1% |
| 1981 | 0.0059 | 0.07 | 8.07 | 8.5% |
| 1980 | 0.0046 | 0.06 | 7.75 | 7.2% |