| Year | Value | | 2024 | 42,833,032 | | 2023 | 42,719,404 | | 2022 | 42,526,426 | | 2021 | 42,082,196 | | 2020 | 41,670,659 | | 2019 | 41,243,483 | | 2018 | 40,641,328 | | 2017 | 40,082,878 | | 2016 | 39,553,942 | | 2015 | 39,012,881 | | 2014 | 38,484,424 | | 2013 | 37,957,319 | | 2012 | 37,459,914 | | 2011 | 36,970,426 | | 2010 | 36,433,945 | | 2009 | 35,904,517 | | 2008 | 35,431,846 | | 2007 | 34,989,303 | | 2006 | 34,919,575 | | 2005 | 34,549,484 | | 2004 | 34,169,474 | | 2003 | 33,777,980 | | 2002 | 33,375,969 | | 2001 | 32,964,158 | | 2000 | 32,545,316 | | 1999 | 32,119,608 | | 1998 | 31,681,455 | | 1997 | 31,229,978 | | 1996 | 30,767,125 | | 1995 | 30,291,081 | | 1994 | 29,785,994 | | 1993 | 29,262,016 | | 1992 | 28,750,581 | | 1991 | 28,253,653 | | 1990 | 27,750,031 | | 1989 | 27,224,286 | | 1988 | 26,684,401 | | 1987 | 26,144,794 | | 1986 | 25,604,835 | | 1985 | 25,051,881 | | 1984 | 24,487,193 | | 1983 | 23,915,533 | | 1982 | 23,344,458 | | 1981 | 22,834,572 | | 1980 | 22,367,355 | | 1979 | 21,888,476 | | 1978 | 21,408,281 | | 1977 | 20,924,395 | | 1976 | 20,439,181 |
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