Year	Number
1970	452500
1971	429400
1972	488800
1973	611800
1974	674400
1975	613100
1976	912600
1977	1077100
1978	1084600
1979	1119700
1980	1112100
1981	1079700
1982	919400
1983	998600
1984	1163400
1985	1215800
1986	1240400
1987	1281300
1988	1322500
1989	1271700
1990	1322000
1991	1148900
1992	918900
1993	979400
1994	1242700
1995	1244900
1996	913300
1997	995200
1998	907600
1999	980300
2000	1218102
2001	1137305
2002	959487
2003	1255313
2004	1337781
2005	1707714
2006	2047466
2007	3003872
2008	3253417
2009	3268022
2010	3733253
2011	3659209
2012	3593312
2013	3087143
2014	3067724.4
2015	3634598
2016	3686938
2017	4423249
2018	4908235
2019	5630289
2020	1786407
2021	2719206