| Year | Value | | 2023 | 387,603 | | 2022 | 408,585 | | 2021 | 425,906 | | 2020 | 437,903 | | 2019 | 446,508 | | 2018 | 452,284 | | 2017 | 455,735 | | 2016 | 456,885 | | 2015 | 455,065 | | 2014 | 449,897 | | 2013 | 441,532 | | 2012 | 430,773 | | 2011 | 418,817 | | 2010 | 406,753 | | 2009 | 395,099 | | 2008 | 377,802 | | 2007 | 358,384 | | 2006 | 342,792 | | 2005 | 328,517 | | 2004 | 316,264 | | 2003 | 306,422 | | 2002 | 299,067 | | 2001 | 294,591 | | 2000 | 293,894 | | 1999 | 297,103 | | 1998 | 303,531 | | 1997 | 309,781 | | 1996 | 315,976 | | 1995 | 322,335 | | 1994 | 329,140 | | 1993 | 335,850 | | 1992 | 343,041 | | 1991 | 350,293 | | 1990 | 357,475 | | 1989 | 366,084 | | 1988 | 368,619 | | 1987 | 362,276 | | 1986 | 349,174 | | 1985 | 329,461 | | 1984 | 304,157 | | 1983 | 277,594 | | 1982 | 254,419 | | 1981 | 235,694 | | 1980 | 220,064 | | 1979 | 207,079 | | 1978 | 199,349 | | 1977 | 192,779 | | 1976 | 178,345 | | 1975 | 155,529 | | 1974 | 130,292 |
|