Year | Value | 2022 | 339 | 2021 | 317 | 2020 | 298 | 2019 | 287 | 2018 | 281 | 2017 | 280 | 2016 | 281 | 2015 | 287 | 2014 | 293 | 2013 | 295 | 2012 | 294 | 2011 | 288 | 2010 | 288 | 2009 | 295 | 2008 | 300 | 2007 | 304 | 2006 | 305 | 2005 | 291 | 2004 | 269 | 2003 | 253 | 2002 | 241 | 2001 | 223 | 2000 | 212 | 1999 | 214 | 1998 | 214 | 1997 | 214 | 1996 | 212 | 1995 | 206 | 1994 | 199 | 1993 | 192 | 1992 | 189 | 1991 | 184 | 1990 | 183 | 1989 | 184 | 1988 | 182 | 1987 | 179 | 1986 | 179 | 1985 | 177 | 1984 | 173 | 1983 | 168 | 1982 | 165 | 1981 | 163 | 1980 | 159 | 1979 | 156 | 1978 | 158 | 1977 | 161 | 1976 | 170 | 1975 | 187 | 1974 | 204 | 1973 | 222 | 1972 | 235 | 1971 | 242 | 1970 | 246 | 1969 | 250 | 1968 | 242 | 1967 | 223 | 1966 | 207 | 1965 | 201 | 1964 | 202 | 1963 | 203 | 1962 | 205 | 1961 | 208 | 1960 | 212 |
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