Year	Number
1970	748900
1971	875100
1972	976100
1973	1248900
1974	1508500
1975	1814700
1976	2132100
1977	2497300
1978	2893200
1979	3377500
1980	3826900
1981	4405400
1982	4591500
1983	4531600
1984	4791800
1985	4912300
1986	4990300
1987	5248400
1988	6046900
1989	6659900
1990	7046400
1991	7745500
1992	8477300
1993	9271200
1994	9929400
1995	10779300
1996	11840700
1997	12980700
1998	13331100
1999	15282600
2000	16704341
2001	16373648
2002	17256872
2003	14172367
2004	16995621
2005	17744017
2006	19565884
2007	20671341
2008	21050204
2009	18427473
2010	24859825.1577843
2011	26509929.1424906
2012	29138458.2737476
2013	31729241
2014	33643518.416782
2015	33585397
2016	35370328
2017	38094990
2018	40401515
2019	43050722
2020	7884373
2021	2311712