
| 2024 | 2.72 | 0.34 | 9.08 | 791.4% |
| 2023 | 2.74 | 0.34 | 9.18 | 811.7% |
| 2022 | 2.75 | 0.33 | 9.35 | 824.8% |
| 2021 | 2.69 | 0.3 | 8.63 | 902% |
| 2020 | 3.03 | 0.27 | 7.94 | 1142.7% |
| 2019 | 3.43 | 0.33 | 10.3 | 1027.2% |
| 2018 | 3.73 | 0.32 | 10.25 | 1161.6% |
| 2017 | 3.85 | 0.29 | 9.47 | 1344.5% |
| 2016 | 3.9 | 0.33 | 11.37 | 1176.6% |
| 2015 | 3.92 | 0.37 | 13.15 | 1059.2% |
| 2014 | 3.77 | 0.35 | 12.97 | 1070.9% |
| 2013 | 3.9 | 0.32 | 12.18 | 1224.5% |
| 2012 | 3.87 | 0.29 | 11.67 | 1318.6% |
| 2011 | 3.79 | 0.27 | 11.26 | 1390.8% |
| 2010 | 4.11 | 0.26 | 11.19 | 1578.8% |
| 2009 | 4.04 | 0.24 | 10.71 | 1685.2% |
| 2008 | 4.21 | 0.21 | 9.62 | 2029.5% |
| 2007 | 3.62 | 0.18 | 8.57 | 2031.8% |
| 2006 | 3 | 0.15 | 7.56 | 1984% |
| 2005 | 2.68 | 0.12 | 6.19 | 2241.9% |
| 2004 | 2.14 | 0.15 | 7.84 | 1470.6% |
| 2003 | 1.9 | 0.13 | 7.47 | 1417% |
| 2002 | 1.93 | 0.12 | 6.95 | 1605.2% |
| 2001 | 1.6 | 0.11 | 6.76 | 1408.5% |
| 2000 | 1.61 | 0.1 | 6.46 | 1542.9% |
| 1999 | 1.61 | 0.09 | 5.64 | 1828% |
| 1998 | 1.58 | 0.08 | 5.11 | 2035.9% |
| 1997 | 1.53 | 0.09 | 6 | 1742.5% |
| 1996 | 1.5 | 0.08 | 5.45 | 1938.5% |
| 1995 | 1.38 | 0.08 | 5.9 | 1711.5% |
| 1994 | 1.07 | 0.07 | 5.66 | 1424.7% |
| 1993 | 1.1 | 0.08 | 6.01 | 1422.1% |
| 1992 | 1.17 | 0.08 | 6.35 | 1477.8% |
| 1991 | 1.08 | 0.08 | 6.52 | 1381% |
| 1990 | 1.03 | 0.07 | 6.42 | 1387.2% |
| 1989 | 1 | 0.07 | 6.26 | 1416% |
| 1988 | 0.99 | 0.07 | 6.71 | 1351.6% |
| 1987 | 0.77 | 0.07 | 6.72 | 1098.9% |
| 1986 | 0.62 | 0.07 | 6.73 | 906.1% |
| 1985 | 0.51 | 0.07 | 7.11 | 733% |
| 1984 | 0.45 | 0.06 | 5.91 | 807.8% |
| 1983 | 0.01 | 0.06 | 6.83 | 23.6% |
| 1982 | 0.01 | 0.06 | 6.6 | 21.7% |
| 1981 | 0.01 | 0.05 | 6.42 | 20.4% |
| 1980 | 0.01 | 0.05 | 6.72 | 20.9% |