Year	Number
1970	2730800
1971	3045500
1972	3129100
1973	3816800
1974	3969800
1975	4109300
1976	4915900
1977	4914900
1978	5137300
1979	6108400
1980	6523600
1981	6950300
1982	7312600
1983	7409200
1984	7523200
1985	7444900
1986	7547000
1987	7658500
1988	8562800
1989	7604700
1990	7960400
1991	7140900
1992	7298800
1993	7175900
1994	7714900
1995	7254800
1996	7578500
1997	7529200
1998	7616900
1999	7515100
2000	7554646
2001	7411821
2002	7387912
2003	7524047
2004	9056444
2005	9802612
2006	10414732
2007	10839781
2008	11082489
2009	11608385
2010	17654275.920899734
2011	21331556.21601915
2012	22107026.960992195
2013	24484619.146003716
2014	25368159.471281476
2015	25261970
2016	26570744
2017	32239144.63031114
2018	38163132.40735727
2019	36727918.80994056
2020	17000506.794
2021	21246706.426