Year	Number
1971	101412
1972	105320
1973	111416
1974	114468
1975	131836
1976	78954
1977	95592
1978	118407
1979	163565
1980	222416
1984	518538
1985	288543
1988	350929
1989	329632
1990	331238
1991	322772
1992	293721
1993	304796
1994	298241
1995	293579
1996	302035
1998	318318
1999	334250
2000	354254
2001	382474
2002	426162
2003	436211
2004	508970
2005	592834
2006	698409
2007	805437
2008	912153
2009	985556
2010	1141367
2011	1288680
2012	1377180
2013	1405793
2014	1466888
2015	1507452
2016	1529464
2017	1500905
2018	1512115