Year	Number
1970	82100
1971	73100
1972	63500
1973	86200
1974	73700
1975	108100
1976	119300
1977	121400
1978	131800
1979	140800
1980	159800
1981	154300
1982	141200
1983	148800
1984	187800
1985	200200
1986	197600
1987	201600
1988	213800
1989	217900
1990	212000
1991	205400
1992	206800
1993	176200
1994	225500
1995	194900
1996	191200
1997	278000
1998	276600
1999	264400
2000	262196
2001	253222
2002	195329
2003	187227
2004	194329
2005	206217
2006	224301
2007	230626
2008	220463
2009	218602
2010	327828.3336328915
2011	364230.3730300119
2012	391242.2470856096
2013	409973
2014	426688.4529493388
2015	466885
2016	468061
2017	482733
2018	496572.902011369
2019	523292.79000000004
2020	308450.215
2021	322356.79900000006