Year	Number
1970	578000
1971	550400
1972	566500
1973	579900
1974	613700
1975	634000
1976	654400
1977	632000
1978	649600
1979	687200
1980	769800
1981	737900
1982	814300
1983	905500
1984	941400
1985	929700
1986	943100
1987	975800
1988	940300
1989	950600
1990	996500
1991	1008200
1992	1017600
1993	1080800
1994	1137200
1995	1149300
1996	1217900
1997	1424700
1998	1492900
1999	1610600
2000	1456463
2001	1446879
2002	1368294
2003	1227248
2004	1266467
2005	1313815
2006	1345358
2007	1464994
2008	1421962
2009	1471241
2010	1932829.9372299917
2011	2031106.146271812
2012	2153840.9082252607
2013	2253790.415076939
2014	2357197.271872366
2015	2447053
2016	2383083
2017	2361676
2018	2422241.325865347
2019	2450088
2020	1130964.27
2021	1585996.8530000001