Year	Number
1970	398053.5
1971	400734.3
1972	424154.3
1973	450373.9
1974	471136.4
1975	487990.1
1976	508056.9
1977	528871.4
1978	537964.6
1979	549174.9
1980	559046.2
1981	569296.8
1982	586529.5
1983	609908.6
1984	630751.3
1985	648918.1
1986	667765.6
1987	684910.9
1988	705188.1
1989	737698.1
1990	787681.1
1991	844408.8
1992	886287.8
1993	931940.1
1994	972449.6
1995	1035168
1996	1090809
1997	1150793
1998	1180062
1999	1221745
2000	1273261
2001	1324559
2002	1379704
2003	1435691
2004	1498040
2005	1549397
2006	1602258
2007	1649306
2008	1672786
2009	1716216
2010	1752068
2011	1786361
2012	1814237
2013	1830302
2014	1860273
2015	1884647
2016	1902245
2017	1933128
2018	1959153