| Year | Value | | 2024 | 140,728 | | 2023 | 141,676 | | 2022 | 140,353 | | 2021 | 137,971 | | 2020 | 135,931 | | 2019 | 133,484 | | 2018 | 131,784 | | 2017 | 130,437 | | 2016 | 129,557 | | 2015 | 129,078 | | 2014 | 128,816 | | 2013 | 128,618 | | 2012 | 128,645 | | 2011 | 129,094 | | 2010 | 129,175 | | 2009 | 129,162 | | 2008 | 130,008 | | 2007 | 130,881 | | 2006 | 133,479 | | 2005 | 138,517 | | 2004 | 146,215 | | 2003 | 155,519 | | 2002 | 165,028 | | 2001 | 173,997 | | 2000 | 182,112 | | 1999 | 187,431 | | 1998 | 189,228 | | 1997 | 189,205 | | 1996 | 189,107 | | 1995 | 189,231 | | 1994 | 189,869 | | 1993 | 187,277 | | 1992 | 181,637 | | 1991 | 176,814 | | 1990 | 172,628 | | 1989 | 170,493 | | 1988 | 167,213 | | 1987 | 160,692 | | 1986 | 152,333 | | 1985 | 141,486 | | 1984 | 129,499 | | 1983 | 119,537 | | 1982 | 114,775 | | 1981 | 117,432 | | 1980 | 127,934 | | 1979 | 144,027 | | 1978 | 161,449 | | 1977 | 175,562 | | 1976 | 183,043 | | 1975 | 183,492 |
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