Year	Number
1971	126994
1972	126840
1978	108236
1979	106316
1980	107348
1982	119307
1983	123998
1984	146130
1985	154661
1986	168957
1987	153467
1988	154369
1989	156650
1990	154410
1991	149265
1994	146427
1995	127856
1996	112699
1997	125847
2001	87280
2002	71561
2003	84467
2004	72789
2005	74568
2006	61327
2007	79641
2008	73199
2014	57329
2015	47780
2016	63964
2017	64833
2018	54034
2019	33752
2020	11417