
| 2024 | 0.48 | 0.06 | 23.08 | 826.5% |
| 2023 | 0.46 | 0.06 | 22.81 | 810.5% |
| 2022 | 0.44 | 0.06 | 23.35 | 780.8% |
| 2021 | 0.4 | 0.05 | 22.4 | 747.1% |
| 2020 | 0.4 | 0.05 | 23.4 | 731.6% |
| 2019 | 0.46 | 0.06 | 24.78 | 810.4% |
| 2018 | 0.45 | 0.06 | 25.71 | 782.4% |
| 2017 | 0.45 | 0.07 | 31.57 | 658.9% |
| 2016 | 0.47 | 0.06 | 30.2 | 743% |
| 2015 | 0.48 | 0.06 | 31.64 | 736.5% |
| 2014 | 0.49 | 0.07 | 34.36 | 722.4% |
| 2013 | 0.49 | 0.06 | 33.46 | 762% |
| 2012 | 0.51 | 0.06 | 34.37 | 808.2% |
| 2011 | 0.52 | 0.05 | 27.95 | 1052.5% |
| 2010 | 0.53 | 0.05 | 27.96 | 1111.4% |
| 2009 | 0.53 | 0.04 | 24.21 | 1309.2% |
| 2008 | 0.54 | 0.04 | 25.49 | 1320.1% |
| 2007 | 0.53 | 0.04 | 26.09 | 1316.3% |
| 2006 | 0.53 | 0.04 | 26.47 | 1319.9% |
| 2005 | 0.59 | 0.04 | 27.04 | 1482.7% |
| 2004 | 0.6 | 0.04 | 25.38 | 1651.1% |
| 2003 | 0.59 | 0.04 | 25.42 | 1691.1% |
| 2002 | 0.56 | 0.04 | 26.83 | 1544.1% |
| 2001 | 0.57 | 0.04 | 27.68 | 1569.7% |
| 2000 | 0.6 | 0.03 | 26.47 | 1776% |
| 1999 | 0.69 | 0.05 | 36.7 | 1513.6% |
| 1998 | 0.77 | 0.04 | 32.1 | 1986.1% |
| 1997 | 0.81 | 0.04 | 33.83 | 2037.7% |
| 1996 | 0.81 | 0.04 | 32.98 | 2120.8% |
| 1995 | 0.8 | 0.04 | 32.15 | 2211.9% |
| 1994 | 0.75 | 0.04 | 35.81 | 1904.7% |
| 1993 | 0.64 | 0.04 | 35.93 | 1676.3% |
| 1992 | 0.63 | 0.04 | 39.16 | 1561.5% |
| 1991 | 0.63 | 0.04 | 39.02 | 1607.7% |
| 1990 | 0.58 | 0.04 | 38.9 | 1527.7% |
| 1989 | 0.47 | 0.04 | 40.69 | 1202% |
| 1988 | 0.37 | 0.03 | 32.78 | 1198.7% |
| 1987 | 0.34 | 0.03 | 31.6 | 1191% |
| 1986 | 0.35 | 0.02 | 27.36 | 1467.2% |
| 1985 | 0.38 | 0.03 | 32.03 | 1371% |
| 1984 | 0.35 | 0.03 | 39.43 | 1062.7% |
| 1983 | 0.0074 | 0.04 | 45.36 | 20.1% |
| 1982 | 0.0037 | 0.03 | 33.99 | 13.9% |
| 1981 | 0.0036 | 0.03 | 37.46 | 12.5% |
| 1980 | 0.0035 | 0.03 | 35.61 | 13.1% |