Year	Number
1970	542500
1971	515400
1972	623100
1973	656300
1974	837000
1975	916900
1976	1112700
1977	1282400
1978	1426300
1979	1689800
1980	2027700
1981	2232600
1982	2433200
1983	2617700
1984	2786200
1985	2786200
1986	2350100
1987	2891200
1988	3192100
1989	3418600
1990	3239200
1991	2595400
1992	3608600
1993	2880500
1994	3537500
1995	3897200
1996	4282400
1997	4416300
1998	3894900
1999	4620100
2000	4521702
2001	4389163
2002	4526688
2003	4180814
2004	4621310
2005	4888146
2006	4988262
2007	5829044
2008	6688999
2009	6215870
2010	9518106.01323615
2011	7708160.10711224
2012	9081175.14629562
2013	10593780.1774399
2014	10278013.1135622
2015	11109554
2016	11844962
2017	11748510
2018	12386010
2019	13206889.61
2020	4638192.256
2021	5563387