| Year | Value | | 2024 | 2,488,769 | | 2023 | 2,531,056 | | 2022 | 2,545,782 | | 2021 | 2,545,792 | | 2020 | 2,544,002 | | 2019 | 2,545,242 | | 2018 | 2,544,826 | | 2017 | 2,534,623 | | 2016 | 2,515,910 | | 2015 | 2,505,041 | | 2014 | 2,512,427 | | 2013 | 2,535,294 | | 2012 | 2,572,416 | | 2011 | 2,617,768 | | 2010 | 2,662,868 | | 2009 | 2,699,070 | | 2008 | 2,716,162 | | 2007 | 2,710,672 | | 2006 | 2,689,605 | | 2005 | 2,667,156 | | 2004 | 2,658,931 | | 2003 | 2,667,065 | | 2002 | 2,683,960 | | 2001 | 2,712,264 | | 2000 | 2,758,842 | | 1999 | 2,817,232 | | 1998 | 2,868,143 | | 1997 | 2,901,677 | | 1996 | 2,918,571 | | 1995 | 2,920,488 | | 1994 | 2,909,190 | | 1993 | 2,879,800 | | 1992 | 2,827,618 | | 1991 | 2,757,578 | | 1990 | 2,674,349 | | 1989 | 2,588,832 | | 1988 | 2,506,316 | | 1987 | 2,423,267 | | 1986 | 2,343,356 | | 1985 | 2,264,784 | | 1984 | 2,186,801 | | 1983 | 2,109,927 | | 1982 | 2,034,833 | | 1981 | 1,961,818 | | 1980 | 1,887,975 | | 1979 | 1,811,493 | | 1978 | 1,725,903 | | 1977 | 1,635,691 | | 1976 | 1,551,564 | | 1975 | 1,471,251 |
|