| Year | Value | | 2023 | 296,860 | | 2022 | 309,195 | | 2021 | 325,324 | | 2020 | 345,691 | | 2019 | 365,615 | | 2018 | 385,373 | | 2017 | 405,104 | | 2016 | 417,482 | | 2015 | 420,001 | | 2014 | 416,368 | | 2013 | 408,993 | | 2012 | 398,926 | | 2011 | 386,816 | | 2010 | 373,725 | | 2009 | 360,064 | | 2008 | 342,213 | | 2007 | 324,251 | | 2006 | 311,366 | | 2005 | 302,602 | | 2004 | 298,772 | | 2003 | 300,207 | | 2002 | 307,349 | | 2001 | 319,696 | | 2000 | 336,505 | | 1999 | 357,149 | | 1998 | 378,955 | | 1997 | 398,008 | | 1996 | 413,831 | | 1995 | 426,837 | | 1994 | 437,159 | | 1993 | 448,112 | | 1992 | 458,497 | | 1991 | 463,921 | | 1990 | 465,750 | | 1989 | 462,194 | | 1988 | 453,381 | | 1987 | 442,004 | | 1986 | 428,733 | | 1985 | 414,958 | | 1984 | 400,051 | | 1983 | 384,997 | | 1982 | 372,140 | | 1981 | 362,672 | | 1980 | 355,590 | | 1979 | 350,287 | | 1978 | 346,762 | | 1977 | 344,538 | | 1976 | 343,927 | | 1975 | 345,669 | | 1974 | 349,177 |
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