Year | Value | 2022 | 12,893,349 | 2021 | 13,657,390 | 2020 | 14,166,299 | 2019 | 14,748,436 | 2018 | 15,334,690 | 2017 | 15,895,582 | 2016 | 16,325,848 | 2015 | 16,557,330 | 2014 | 16,620,783 | 2013 | 16,595,005 | 2012 | 16,427,374 | 2011 | 16,112,463 | 2010 | 15,795,764 | 2009 | 15,505,000 | 2008 | 15,185,034 | 2007 | 14,904,144 | 2006 | 14,746,806 | 2005 | 14,593,937 | 2004 | 14,432,865 | 2003 | 14,271,036 | 2002 | 14,125,608 | 2001 | 13,982,276 | 2000 | 13,798,249 | 1999 | 13,597,893 | 1998 | 13,449,522 | 1997 | 13,277,589 | 1996 | 13,096,161 | 1995 | 13,049,833 | 1994 | 13,171,203 | 1993 | 13,403,235 | 1992 | 13,728,581 | 1991 | 14,120,646 | 1990 | 14,493,335 | 1989 | 14,814,364 | 1988 | 14,954,564 | 1987 | 14,930,648 | 1986 | 14,795,637 | 1985 | 14,572,428 | 1984 | 14,363,808 | 1983 | 14,162,303 | 1982 | 13,893,241 | 1981 | 13,598,956 | 1980 | 13,309,172 | 1979 | 13,016,688 | 1978 | 12,649,183 | 1977 | 12,236,475 | 1976 | 11,793,651 | 1975 | 11,017,119 | 1974 | 9,913,315 | 1973 | 8,838,711 | 1972 | 8,064,495 | 1971 | 7,850,649 | 1970 | 8,330,133 | 1969 | 9,357,971 | 1968 | 10,657,228 | 1967 | 11,859,447 | 1966 | 12,495,709 | 1965 | 12,536,519 | 1964 | 12,131,727 | 1963 | 11,401,207 | 1962 | 10,732,817 | 1961 | 10,318,124 | 1960 | 10,301,692 |
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