| Year | Value | | 2024 | 31,686,773 | | 2023 | 30,894,968 | | 2022 | 30,274,281 | | 2021 | 29,861,163 | | 2020 | 29,199,291 | | 2019 | 28,337,682 | | 2018 | 27,557,586 | | 2017 | 26,825,487 | | 2016 | 26,143,845 | | 2015 | 25,554,853 | | 2014 | 24,859,678 | | 2013 | 24,094,061 | | 2012 | 23,426,271 | | 2011 | 22,650,394 | | 2010 | 21,987,632 | | 2009 | 21,509,103 | | 2008 | 20,888,394 | | 2007 | 20,574,843 | | 2006 | 20,311,194 | | 2005 | 19,595,425 | | 2004 | 18,990,038 | | 2003 | 18,377,389 | | 2002 | 17,328,835 | | 2001 | 16,482,777 | | 2000 | 16,394,501 | | 1999 | 16,230,356 | | 1998 | 15,666,015 | | 1997 | 15,113,581 | | 1996 | 14,573,046 | | 1995 | 14,022,249 | | 1994 | 13,371,924 | | 1993 | 12,313,104 | | 1992 | 10,956,720 | | 1991 | 10,112,171 | | 1990 | 9,966,093 | | 1989 | 9,837,858 | | 1988 | 9,561,075 | | 1987 | 9,463,094 | | 1986 | 9,505,317 | | 1985 | 9,527,542 | | 1984 | 9,347,815 | | 1983 | 9,139,043 | | 1982 | 9,220,955 | | 1981 | 10,039,057 | | 1980 | 11,104,231 | | 1979 | 11,547,475 | | 1978 | 11,551,606 | | 1977 | 11,374,276 | | 1976 | 11,194,969 |
|