Year	Number
1970	742803.1
1971	779457.2
1972	814760.7
1973	913182.6
1974	965348.5
1975	1040006
1976	1098402
1977	1165528
1978	1247178
1979	1351761
1980	1459414
1981	1575709
1982	1667133
1983	1789116
1984	1882396
1985	1995655
1986	1969083
1987	2038226
1988	2106548
1989	2078950
1990	2055047
1991	2035000
1992	2041354
1993	2110852
1994	2191467
1995	2248933
1996	2281758
1997	2382628
1998	2395084
1999	2418232
2000	2524958
2001	2599931
2002	2660108
2003	2808137
2004	3024475
2005	3338776
2006	3615817
2007	3979720
2008	4359659
2009	4757253
2010	5095774
2011	5274855
2012	5499475
2013	5480654
2014	5579747
2015	5670770
2016	5720412
2017	5772292
2018	5816735