| Year | Value | | 2023 | 4,322,010 | | 2022 | 4,246,788 | | 2021 | 4,177,346 | | 2020 | 4,106,403 | | 2019 | 4,031,453 | | 2018 | 3,958,303 | | 2017 | 3,885,599 | | 2016 | 3,813,592 | | 2015 | 3,741,655 | | 2014 | 3,670,658 | | 2013 | 3,601,252 | | 2012 | 3,532,721 | | 2011 | 3,464,587 | | 2010 | 3,400,379 | | 2009 | 3,342,456 | | 2008 | 3,290,228 | | 2007 | 3,240,344 | | 2006 | 3,190,784 | | 2005 | 3,139,902 | | 2004 | 3,087,694 | | 2003 | 3,034,843 | | 2002 | 2,977,912 | | 2001 | 2,903,342 | | 2000 | 2,822,361 | | 1999 | 2,736,365 | | 1998 | 2,648,660 | | 1997 | 2,560,887 | | 1996 | 2,473,804 | | 1995 | 2,387,499 | | 1994 | 2,302,243 | | 1993 | 2,218,169 | | 1992 | 2,134,712 | | 1991 | 2,048,932 | | 1990 | 1,965,167 | | 1989 | 1,883,342 | | 1988 | 1,803,565 | | 1987 | 1,726,049 | | 1986 | 1,651,238 | | 1985 | 1,579,205 | | 1984 | 1,510,122 | | 1983 | 1,443,758 | | 1982 | 1,380,325 | | 1981 | 1,325,167 | | 1980 | 1,272,833 | | 1979 | 1,223,520 | | 1978 | 1,177,045 | | 1977 | 1,132,733 | | 1976 | 1,090,237 | | 1975 | 1,049,231 |
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