Year	Number
1971	10556
1972	11625
1974	12731
1975	14195
1976	16391
1977	19580
1985	45612
1987	44379
1989	49439
1990	58570
1994	73666
1995	85836
1996	93026
1997	99789
1998	112964
1999	123408
2000	137269
2001	165926
2002	184996
2003	212632
2004	227856
2005	245286
2006	262714
2007	314470
2008	369812
2009	421686
2010	430383
2011	456548
2012	458034
2013	525219
2014	508730
2015	513248
2016	535112
2017	507074
2018	511841
2019	537388
2021	663802