
| 2024 | 1.15 | 4.98 | 103.9 | 23.2% |
| 2023 | 1.11 | 4.9 | 102.3 | 22.7% |
| 2022 | 1.09 | 5.05 | 105.6 | 21.5% |
| 2021 | 1.08 | 4.92 | 103 | 22% |
| 2020 | 1.06 | 4.61 | 96.77 | 23% |
| 2019 | 1.02 | 5.27 | 111 | 19.4% |
| 2018 | 1.04 | 5.32 | 112.9 | 19.5% |
| 2017 | 1.01 | 5.31 | 113.2 | 19.1% |
| 2016 | 1.05 | 5.18 | 110.8 | 20.2% |
| 2015 | 1.03 | 5.07 | 108.6 | 20.2% |
| 2014 | 1.09 | 4.98 | 106.5 | 22% |
| 2013 | 1.09 | 5.03 | 107.4 | 21.6% |
| 2012 | 1.06 | 5.29 | 112.5 | 20.1% |
| 2011 | 1.04 | 5.4 | 114.9 | 19.4% |
| 2010 | 1.16 | 5.63 | 120.2 | 20.5% |
| 2009 | 1 | 5.6 | 120 | 17.9% |
| 2008 | 1.01 | 6.1 | 131.9 | 16.6% |
| 2007 | 1.08 | 6.38 | 140.2 | 17% |
| 2006 | 1.13 | 6.24 | 139.6 | 18% |
| 2005 | 1.1 | 6.24 | 141.9 | 17.6% |
| 2004 | 1.21 | 6.06 | 140.2 | 19.9% |
| 2003 | 1.21 | 5.76 | 135.5 | 21% |
| 2002 | 1.18 | 5.65 | 135.2 | 20.8% |
| 2001 | 1.24 | 5.43 | 131.6 | 22.8% |
| 2000 | 1.17 | 5.28 | 128.7 | 22.2% |
| 1999 | 1.13 | 5.03 | 123.3 | 22.4% |
| 1998 | 1.2 | 4.81 | 118.5 | 25% |
| 1997 | 1.17 | 4.58 | 113.3 | 25.5% |
| 1996 | 1.21 | 4.29 | 106.5 | 28.3% |
| 1995 | 1.18 | 4.29 | 107.2 | 27.5% |
| 1994 | 1.21 | 4.08 | 102.3 | 29.8% |
| 1993 | 1.27 | 3.94 | 99.27 | 32.2% |
| 1992 | 1.31 | 4.08 | 103.4 | 32.2% |
| 1991 | 1.35 | 4.01 | 102.4 | 33.6% |
| 1990 | 1.36 | 3.83 | 97.99 | 35.4% |
| 1989 | 1.42 | 3.8 | 97.25 | 37.4% |
| 1988 | 1.32 | 3.56 | 91.27 | 37.2% |
| 1987 | 1.27 | 3.37 | 86.83 | 37.5% |
| 1986 | 1.29 | 3.29 | 84.88 | 39.1% |
| 1985 | 1.22 | 3.21 | 83.13 | 38% |
| 1984 | 1.17 | 3.13 | 81.38 | 37.5% |
| 1983 | 0.93 | 3.38 | 88.43 | 27.4% |
| 1982 | 0.89 | 3.3 | 86.74 | 27.1% |
| 1981 | 0.81 | 3.07 | 81.32 | 26.2% |
| 1980 | 0.66 | 2.98 | 79.31 | 22.3% |