| Year | Value | | 2023 | 444,165 | | 2022 | 451,592 | | 2021 | 454,651 | | 2020 | 452,409 | | 2019 | 446,632 | | 2018 | 437,688 | | 2017 | 426,477 | | 2016 | 414,443 | | 2015 | 402,557 | | 2014 | 390,841 | | 2013 | 378,800 | | 2012 | 366,084 | | 2011 | 352,600 | | 2010 | 338,914 | | 2009 | 326,356 | | 2008 | 312,261 | | 2007 | 300,631 | | 2006 | 295,602 | | 2005 | 294,317 | | 2004 | 296,388 | | 2003 | 300,764 | | 2002 | 305,434 | | 2001 | 309,076 | | 2000 | 312,087 | | 1999 | 315,262 | | 1998 | 319,879 | | 1997 | 326,779 | | 1996 | 334,259 | | 1995 | 341,809 | | 1994 | 348,942 | | 1993 | 349,628 | | 1992 | 341,325 | | 1991 | 326,875 | | 1990 | 306,790 | | 1989 | 282,458 | | 1988 | 257,441 | | 1987 | 235,088 | | 1986 | 217,164 | | 1985 | 202,391 | | 1984 | 190,122 | | 1983 | 180,479 | | 1982 | 171,818 | | 1981 | 160,594 | | 1980 | 145,673 | | 1979 | 128,997 | | 1978 | 111,830 | | 1977 | 99,252 | | 1976 | 97,821 | | 1975 | 108,349 | | 1974 | 126,340 |
|