| Year | Value | | 2023 | 8,060,566 | | 2022 | 7,936,838 | | 2021 | 7,796,411 | | 2020 | 7,639,310 | | 2019 | 7,469,611 | | 2018 | 7,307,801 | | 2017 | 7,158,078 | | 2016 | 7,014,904 | | 2015 | 6,881,683 | | 2014 | 6,759,616 | | 2013 | 6,644,298 | | 2012 | 6,543,550 | | 2011 | 6,470,595 | | 2010 | 6,424,305 | | 2009 | 6,396,902 | | 2008 | 6,376,352 | | 2007 | 6,344,145 | | 2006 | 6,286,066 | | 2005 | 6,200,513 | | 2004 | 6,090,284 | | 2003 | 5,958,199 | | 2002 | 5,810,946 | | 2001 | 5,655,792 | | 2000 | 5,495,179 | | 1999 | 5,329,769 | | 1998 | 5,161,393 | | 1997 | 4,994,815 | | 1996 | 4,831,530 | | 1995 | 4,669,376 | | 1994 | 4,512,492 | | 1993 | 4,349,769 | | 1992 | 4,170,041 | | 1991 | 3,981,916 | | 1990 | 3,800,667 | | 1989 | 3,631,839 | | 1988 | 3,484,517 | | 1987 | 3,368,444 | | 1986 | 3,277,845 | | 1985 | 3,196,494 | | 1984 | 3,113,904 | | 1983 | 3,033,145 | | 1982 | 2,950,730 | | 1981 | 2,865,149 | | 1980 | 2,776,363 | | 1979 | 2,687,566 | | 1978 | 2,606,459 | | 1977 | 2,537,401 | | 1976 | 2,479,118 | | 1975 | 2,431,620 |
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