Year	Number
1971	9105
1972	10079
1973	12090
1974	11418
1975	12885
1976	15128
1977	18382
1985	43053
1987	40260
1988	41073
1989	45147
1990	54751
1991	59565
1992	72641
1993	79458
1994	69784
1995	82559
1996	90100
1997	97011
1998	110545
1999	120523
2000	133959
2001	162497
2002	181449
2003	209160
2004	224661
2005	241813
2006	258963
2007	310830
2008	365655
2009	416978
2010	424815
2011	450014
2012	451179
2013	517695
2014	501028
2015	505167
2016	527321