Year	Number
1970	255900
1971	280400
1972	307300
1973	314400
1974	374300
1975	371800
1976	390500
1977	326800
1978	321300
1979	366000
1980	431200
1981	427600
1982	458600
1983	379600
1984	322500
1985	310000
1986	334700
1987	347600
1988	400600
1989	440800
1990	467000
1991	507600
1992	622800
1993	690300
1994	773200
1995	870400
1996	917900
1997	991500
1998	1169500
1999	1055300
2000	877833
2001	737895
2002	675146
2003	749885
2004	901402
2005	953217
2006	943143
2007	1017054
2008	1023665
2009	932581
2010	1697893.8890269
2011	1829514.94708223
2012	1770111.37834698
2013	1498996
2014	1427414
2015	1525922
2016	1572605
2017	1822880
2018	1950049
2019	2033146
2020	455830.6
2021	669298