
| 2024 | 0.6 | 0.19 | 416.2 | 313.5% |
| 2023 | 0.56 | 0.18 | 390.1 | 314% |
| 2022 | 0.58 | 0.18 | 402.8 | 318.7% |
| 2021 | 0.65 | 0.19 | 421.1 | 339.8% |
| 2020 | 0.69 | 0.2 | 447.8 | 346.4% |
| 2019 | 0.73 | 0.18 | 415.1 | 396% |
| 2018 | 0.7 | 0.18 | 415.2 | 384.5% |
| 2017 | 0.71 | 0.18 | 404.8 | 403% |
| 2016 | 0.68 | 0.17 | 408.1 | 390.4% |
| 2015 | 0.71 | 0.17 | 395.7 | 424% |
| 2014 | 0.67 | 0.15 | 362.7 | 443.6% |
| 2013 | 0.72 | 0.13 | 326.9 | 537.6% |
| 2012 | 0.77 | 0.14 | 356.4 | 533.6% |
| 2011 | 0.81 | 0.15 | 372.3 | 547.8% |
| 2010 | 0.79 | 0.14 | 369 | 545.1% |
| 2009 | 0.77 | 0.13 | 330.1 | 608.7% |
| 2008 | 0.88 | 0.19 | 507.1 | 458.7% |
| 2007 | 0.91 | 0.19 | 502.9 | 485.9% |
| 2006 | 0.97 | 0.18 | 487.2 | 546.5% |
| 2005 | 0.86 | 0.12 | 321.2 | 743% |
| 2004 | 0.87 | 0.1 | 290 | 847.8% |
| 2003 | 0.87 | 0.09 | 265.9 | 944.1% |
| 2002 | 0.84 | 0.09 | 261.9 | 945.1% |
| 2001 | 0.81 | 0.08 | 228.9 | 1061.5% |
| 2000 | 0.78 | 0.07 | 205.5 | 1157% |
| 1999 | 0.74 | 0.07 | 206 | 1129.2% |
| 1998 | 0.67 | 0.06 | 178.5 | 1205.1% |
| 1997 | 0.73 | 0.06 | 202 | 1181.5% |
| 1996 | 0.73 | 0.06 | 193.3 | 1274% |
| 1995 | 0.76 | 0.06 | 212.6 | 1228.7% |
| 1994 | 0.73 | 0.05 | 176.2 | 1453% |
| 1993 | 0.74 | 0.05 | 188.1 | 1413.7% |
| 1992 | 0.71 | 0.05 | 203.1 | 1301.1% |
| 1991 | 0.66 | 0.06 | 213.4 | 1181.8% |
| 1990 | 0.7 | 0.07 | 274.7 | 1001.8% |
| 1989 | 0.68 | 0.08 | 334.1 | 826.4% |
| 1988 | 0.68 | 0.07 | 292.8 | 967.6% |
| 1987 | 0.7 | 0.08 | 348.2 | 856.9% |
| 1986 | 0.7 | 0.05 | 225.1 | 1374.7% |
| 1985 | 0.71 | 0.08 | 351.5 | 920.4% |
| 1984 | 0.73 | 0.06 | 304.6 | 1130.8% |
| 1983 | 0.4 | 0.07 | 356.5 | 550.6% |
| 1982 | 0.39 | 0.09 | 468.6 | 423.6% |
| 1981 | 0.42 | 0.09 | 443.4 | 489.2% |
| 1980 | 0.38 | 0.08 | 442.3 | 466% |