Year	Number
1970	390500
1971	263700
1972	525300
1973	590000
1974	1116900
1975	1335200
1976	1439200
1977	1425000
1978	1449000
1979	1686100
1980	1980100
1981	1777100
1982	1739700
1983	1698200
1984	1616800
1985	1563900
1986	2152900
1987	3009000
1988	2737100
1989	1854300
1990	1816200
1991	1490600
1992	1217600
1993	1362400
1994	1894900
1995	2508300
1996	2327500
1997	2724500
1998	2774500
1999	1900000
2000	1595268
2001	2248991
2002	2085823
2003	2226329
2004	3225128
2005	4332223
2006	4217880
2007	5273188
2008	6184410
2009	5843195
2010	7106025.29251721
2011	8609620.35441221
2012	10074855.6119232
2013	12255937.7629497
2014	12284677
2015	13877662
2016	15081755
2017	16094150
2018	17758527.272
2019	18820572
2020	5705074
2021	9053965