Year	Number
1970	380320
1971	399657.6
1972	411040.9
1973	466158.9
1974	495859.3
1975	556098.9
1976	594378.4
1977	643485.1
1978	713409.4
1979	801921.3
1980	899235.5
1981	1009940
1982	1089166
1983	1164389
1984	1220487
1985	1297884
1986	1262072
1987	1312214
1988	1366718
1989	1309824
1990	1324353
1991	1327931
1992	1359860
1993	1417182
1994	1494841
1995	1579159
1996	1620273
1997	1650880
1998	1679952
1999	1708263
2000	1826451
2001	1904294
2002	1972809
2003	2074598
2004	2133122
2005	2150871
2006	2218454
2007	2375236
2008	2585660
2009	2796206
2010	3013148
2011	3109136
2012	3208970
2013	3312909
2014	3450019
2015	3454520
2016	3483640
2017	3550089
2018	3654092