Year	Number
1970	558000
1971	513600
1972	762000
1973	968300
1974	1282500
1975	1835700
1976	3268000
1977	4705100
1978	6268100
1979	7689200
1980	9241200
1981	9146900
1982	10151800
1983	10670300
1984	11365800
1985	10795100
1986	9929400
1987	10258400
1988	9879600
1989	9988000
1990	10311500
1991	9409100
1992	11154800
1993	11864300
1994	12142300
1995	11524200
1996	11706300
1997	11738200
1998	11816200
1999	12328500
2000	12566492
2001	12835735
2002	13564300
2003	13821729
2004	14942633
2005	15933045
2006	16830838
2007	17141188
2008	16708204
2009	17508200
2010	20323592
2011	23135735
2012	26537661
2013	28252104
2014	32269452
2015	33431736
2016	35092840
2017	37503000
2018	39767648
2019	46181487
2020	20968865.89
2021	29403732