| 2024 | 17.259 |
| 2023 | 17.249 |
| 2022 | 16.957 |
| 2021 | 16.589 |
| 2020 | 16.619 |
| 2019 | 16.659 |
| 2018 | 16.480 |
| 2017 | 16.175 |
| 2016 | 15.778 |
| 2015 | 15.222 |
| 2014 | 15.005 |
| 2013 | 14.695 |
| 2012 | 14.306 |
| 2011 | 14.379 |
| 2010 | 13.877 |
| 2009 | 13.631 |
| 2008 | 13.522 |
| 2007 | 13.365 |
| 2006 | 13.189 |
| 2005 | 12.688 |
| 2004 | 12.285 |
| 2003 | 11.889 |
| 2002 | 11.581 |
| 2001 | 11.226 |
| 2000 | 11.016 |
| 1999 | 10.868 |
| 1998 | 10.671 |
| 1997 | 10.451 |
| 1996 | 10.234 |
| 1995 | 9.800 |
| 1994 | 9.433 |
| 1993 | 8.847 |
| 1992 | 8.203 |
| 1991 | 7.563 |
| 1990 | 7.218 |
| 1989 | 7.039 |
| 1988 | 6.858 |
| 1987 | 6.554 |
| 1986 | 6.359 |
| 1985 | 6.259 |
| 1984 | 6.243 |
| 1983 | 6.185 |
| 1982 | 6.193 |
| 1981 | 6.111 |
| 1980 | 5.998 |
| 1979 | 5.934 |
| 1978 | 5.886 |
| 1977 | 5.808 |
| 1976 | 5.743 |
| 1975 | 5.657 |
| 1974 | 5.538 |
| 1973 | 5.399 |
| 1972 | 5.060 |
| 1971 | 4.726 |
| 1970 | 4.519 |
| 1969 | 4.388 |
| 1968 | 4.105 |
| 1967 | 3.899 |
| 1966 | 3.663 |
| 1965 | 3.368 |
| 1964 | 3.000 |
| 1963 | 2.778 |
| 1962 | 2.516 |
| 1961 | 2.363 |
| 1960 | 2.225 |
| 1959 | 2.114 |
| 1958 | 1.995 |
| 1957 | 1.890 |
| 1956 | 1.741 |
| 1950 | 1.589 |
| 1939 | 902 |
| 1925 | 726 |
| 1900 | 440 |
| 1871 | 322 |
| 1840 | 307 |