
| 2024 | 1.1 | 0.83 | 547.3 | 131.7% |
| 2023 | 1.1 | 0.83 | 554.7 | 133.7% |
| 2022 | 1.06 | 0.81 | 556.2 | 131.3% |
| 2021 | 1.07 | 0.82 | 573.2 | 131.3% |
| 2020 | 1.05 | 0.78 | 555.5 | 134.6% |
| 2019 | 1.1 | 0.79 | 560.4 | 139% |
| 2018 | 1.03 | 0.72 | 508.4 | 143.4% |
| 2017 | 1.03 | 0.71 | 505.5 | 145.4% |
| 2016 | 1.02 | 0.69 | 511.5 | 146.8% |
| 2015 | 1.02 | 0.69 | 535.1 | 147.4% |
| 2014 | 1.02 | 0.69 | 553.4 | 148.8% |
| 2013 | 0.98 | 0.69 | 583 | 141.7% |
| 2012 | 0.89 | 0.62 | 541.8 | 143.1% |
| 2011 | 0.89 | 0.58 | 508.4 | 153.1% |
| 2010 | 0.88 | 0.59 | 511.1 | 149.1% |
| 2009 | 0.87 | 0.58 | 518.2 | 149.6% |
| 2008 | 0.87 | 0.59 | 552.8 | 148% |
| 2007 | 0.85 | 0.56 | 559.5 | 151.2% |
| 2006 | 0.83 | 0.55 | 579.3 | 152% |
| 2005 | 0.81 | 0.51 | 579 | 159.2% |
| 2004 | 0.78 | 0.46 | 552.4 | 171.6% |
| 2003 | 0.78 | 0.44 | 572.8 | 176.5% |
| 2002 | 0.76 | 0.42 | 591.3 | 181.1% |
| 2001 | 0.74 | 0.4 | 595.5 | 186.7% |
| 2000 | 0.74 | 0.38 | 601.5 | 192.7% |
| 1999 | 0.72 | 0.36 | 581.4 | 199.7% |
| 1998 | 0.73 | 0.35 | 580.2 | 207.7% |
| 1997 | 0.72 | 0.33 | 566.3 | 213.6% |
| 1996 | 0.66 | 0.28 | 492.8 | 230.8% |
| 1995 | 0.65 | 0.28 | 504.4 | 229.8% |
| 1994 | 0.65 | 0.28 | 516.8 | 228.6% |
| 1993 | 0.35 | 0.29 | 538.6 | 122.9% |
| 1992 | 0.31 | 0.24 | 463.4 | 127.6% |
| 1991 | 0.35 | 0.29 | 568.9 | 123% |
| 1990 | 0.32 | 0.26 | 525.1 | 125% |
| 1989 | 0.3 | 0.23 | 496.7 | 128.6% |
| 1988 | 0.3 | 0.23 | 503.3 | 129.8% |
| 1987 | 0.33 | 0.27 | 605.9 | 125.5% |
| 1986 | 0.3 | 0.22 | 522.4 | 133.7% |
| 1985 | 0.27 | 0.2 | 500.1 | 134.5% |
| 1984 | 0.24 | 0.17 | 436.2 | 142% |
| 1983 | 0.15 | 0.18 | 465.7 | 82.9% |
| 1982 | 0.14 | 0.17 | 459.1 | 80.8% |
| 1981 | 0.13 | 0.16 | 446.1 | 79.6% |
| 1980 | 0.1 | 0.14 | 402.9 | 76.4% |