Year | Value | 2022 | 291,967 | 2021 | 284,229 | 2020 | 276,374 | 2019 | 268,805 | 2018 | 260,974 | 2017 | 254,592 | 2016 | 251,423 | 2015 | 252,839 | 2014 | 259,337 | 2013 | 269,842 | 2012 | 282,570 | 2011 | 295,486 | 2010 | 306,156 | 2009 | 311,278 | 2008 | 310,380 | 2007 | 304,906 | 2006 | 295,922 | 2005 | 285,240 | 2004 | 274,425 | 2003 | 264,324 | 2002 | 255,907 | 2001 | 249,928 | 2000 | 246,374 | 1999 | 245,121 | 1998 | 244,604 | 1997 | 244,586 | 1996 | 245,473 | 1995 | 247,428 | 1994 | 251,428 | 1993 | 257,564 | 1992 | 264,682 | 1991 | 271,561 | 1990 | 275,738 | 1989 | 275,583 | 1988 | 275,045 | 1987 | 277,553 | 1986 | 281,719 | 1985 | 287,002 | 1984 | 293,527 | 1983 | 297,025 | 1982 | 293,926 | 1981 | 286,471 | 1980 | 277,260 | 1979 | 267,891 | 1978 | 261,532 | 1977 | 259,416 | 1976 | 259,760 | 1975 | 261,288 | 1974 | 262,418 | 1973 | 263,817 | 1972 | 265,904 | 1971 | 267,391 | 1970 | 269,465 | 1969 | 274,234 | 1968 | 281,881 | 1967 | 290,877 | 1966 | 300,504 | 1965 | 308,767 | 1964 | 313,920 | 1963 | 314,834 | 1962 | 309,956 | 1961 | 298,004 | 1960 | 281,288 |
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