Year	Number
1970	1171900
1971	1092500
1972	1364400
1973	1367000
1974	1514700
1975	1621000
1976	1656800
1977	1538100
1978	1680300
1979	1758600
1980	1460800
1981	955000
1982	852600
1983	908400
1984	910700
1985	980300
1986	991000
1987	1069600
1988	1153800
1989	1168800
1990	1095700
1991	837400
1992	973800
1993	1024900
1994	1071600
1995	1284600
1996	1393600
1997	1447800
1998	1600800
1999	1852600
2000	2229216
2001	2565808
2002	2808793
2003	3391474
2004	4219478
2005	4706226
2006	4921600
2007	4869586
2008	4974879
2009	5048360
2010	5145187
2011	4902816
2012	3594882
2013	5186676
2014	5009995
2015	3378028
2016	4048658
2017	5450671
2018	8851291
2019	5446163.2
2020	929888.181
2021	1418032