Year	Number
1970	241000
1971	280000
1972	320000
1973	350000
1974	127500
1975	173000
1976	240100
1977	299800
1978	374500
1979	456500
1980	521500
1981	577800
1982	569800
1983	601800
1984	674200
1985	717500
1986	647400
1987	621500
1988	698400
1989	752800
1990	770900
1991	875500
1992	981100
1993	1080000
1994	1150600
1995	1072500
1996	1200300
1997	1164600
1998	1207000
1999	1307000
2000	1382461
2001	1250076
2002	1255713
2003	1850491
2004	2284547
2009	5215512
2010	6028980
2011	5590998.04060636
2012	5861786.99900694
2013	4626648
2014	5171496
2015	5313756
2016	5220218
2017	5190484
2018	5877003
2019	6440562
2020	1451359
2021	1840268