Year	Number
1971	186656
1975	251512
1978	255306
1979	242733
1980	225804
1981	215654
1982	203685
1983	185819
1984	167820
1985	167632
1986	156379
1987	141708
1988	139079
1989	129014
1990	134342
1991	124878
1992	124785
1993	120081
1994	117095
1995	105888
1996	106710
1997	108231
1999	93455
2000	83509
2001	72355
2002	47773
2003	42347
2004	40902
2005	55597
2006	43059
2007	41943
2008	31148
2009	22795
2010	13804
2011	19354
2012	10842
2013	8014
2014	9497
2015	9608
2016	10430
2017	10003
2018	9836
2020	7770
2021	13122
2022	21781