| Year | Value | | 2024 | 500,550 | | 2023 | 505,520 | | 2022 | 504,907 | | 2021 | 495,405 | | 2020 | 475,206 | | 2019 | 446,083 | | 2018 | 411,789 | | 2017 | 378,156 | | 2016 | 352,246 | | 2015 | 335,248 | | 2014 | 325,099 | | 2013 | 322,571 | | 2012 | 323,462 | | 2011 | 322,167 | | 2010 | 319,223 | | 2009 | 315,936 | | 2008 | 311,796 | | 2007 | 308,375 | | 2006 | 305,656 | | 2005 | 302,241 | | 2004 | 297,742 | | 2003 | 292,549 | | 2002 | 286,444 | | 2001 | 279,710 | | 2000 | 273,139 | | 1999 | 266,453 | | 1998 | 259,034 | | 1997 | 251,226 | | 1996 | 243,147 | | 1995 | 234,603 | | 1994 | 226,077 | | 1993 | 218,245 | | 1992 | 211,509 | | 1991 | 206,100 | | 1990 | 201,682 | | 1989 | 197,779 | | 1988 | 194,396 | | 1987 | 191,339 | | 1986 | 188,280 | | 1985 | 185,287 | | 1984 | 182,193 | | 1983 | 178,671 | | 1982 | 174,990 | | 1981 | 171,667 | | 1980 | 169,527 | | 1979 | 168,489 | | 1978 | 167,610 | | 1977 | 166,485 | | 1976 | 165,115 | | 1975 | 163,806 |
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