Year	Number
1971	104731
1972	115367
1973	125001
1974	136649
1975	138799
1976	124373
1977	118338
1978	109929
1979	99953
1980	96011
1981	100873
1982	123691
1983	143992
1984	154741
1985	155510
1986	88892
1987	66337
1988	48502
1989	42128
1990	43941
1991	51680
1992	62402
1993	69851
1994	11358
1995	8793
1996	6893
1997	3825
1999	6240
2000	5766
2001	6295
2002	6832
2003	12650
2004	19735
2005	20661
2006	15761
2007	5798
2008	2532
2009	9
2010	3259
2011	6162
2012	15035
2015	38201
2016	26698