
| 2024 | 0.07 | 0.11 | 284.8 | 58% |
| 2023 | 0.07 | 0.11 | 292.3 | 59.7% |
| 2022 | 0.07 | 0.11 | 296.9 | 60% |
| 2021 | 0.07 | 0.1 | 276.2 | 64.3% |
| 2020 | 0.06 | 0.1 | 260.7 | 67.5% |
| 2019 | 0.07 | 0.11 | 309 | 59.3% |
| 2018 | 0.07 | 0.12 | 340.3 | 56% |
| 2017 | 0.07 | 0.11 | 329.4 | 57.5% |
| 2016 | 0.06 | 0.11 | 315.5 | 58.5% |
| 2015 | 0.06 | 0.1 | 312 | 61.3% |
| 2014 | 0.06 | 0.1 | 295.9 | 62.7% |
| 2013 | 0.06 | 0.1 | 298.1 | 63.6% |
| 2012 | 0.06 | 0.09 | 289.2 | 63.6% |
| 2011 | 0.06 | 0.09 | 285.8 | 63% |
| 2010 | 0.06 | 0.09 | 287.2 | 62.5% |
| 2009 | 0.06 | 0.11 | 332.5 | 53.8% |
| 2008 | 0.06 | 0.11 | 337.3 | 52.1% |
| 2007 | 0.04 | 0.09 | 282.8 | 46.1% |
| 2006 | 0.03 | 0.08 | 265.1 | 41.7% |
| 2005 | 0.03 | 0.07 | 248.1 | 39.9% |
| 2004 | 0.03 | 0.07 | 250.5 | 39.9% |
| 2003 | 0.03 | 0.07 | 243.7 | 40.7% |
| 2002 | 0.03 | 0.07 | 245 | 40.4% |
| 2001 | 0.03 | 0.07 | 238.1 | 40% |
| 2000 | 0.03 | 0.07 | 242.5 | 38.1% |
| 1999 | 0.02 | 0.06 | 230.3 | 38% |
| 1998 | 0.02 | 0.06 | 221.2 | 35% |
| 1997 | 0.02 | 0.06 | 208.2 | 33.4% |
| 1996 | 0.02 | 0.06 | 204.5 | 31.5% |
| 1995 | 0.02 | 0.05 | 191 | 32.9% |
| 1994 | 0.02 | 0.05 | 202.1 | 30% |
| 1993 | 0.02 | 0.05 | 185 | 32.7% |
| 1992 | 0.02 | 0.05 | 181 | 32.5% |
| 1991 | 0.02 | 0.05 | 177.4 | 33.2% |
| 1990 | 0.02 | 0.05 | 186.7 | 32% |
| 1989 | 0.02 | 0.05 | 180.5 | 33.4% |
| 1988 | 0.02 | 0.04 | 176.4 | 34.2% |
| 1987 | 0.01 | 0.04 | 168.2 | 34.3% |
| 1986 | 0.01 | 0.04 | 163.5 | 34.8% |
| 1985 | 0.01 | 0.04 | 159.6 | 34.1% |
| 1984 | 0.01 | 0.04 | 161 | 34.7% |
| 1983 | 0.01 | 0.04 | 152.1 | 35.7% |
| 1982 | 0.01 | 0.03 | 139.1 | 37.5% |
| 1981 | 0.01 | 0.03 | 145.8 | 32.6% |
| 1980 | 0.01 | 0.03 | 152.7 | 30.4% |