Year	Number
1977	147728
1978	142575
1981	125257
1982	120857
1983	118302
1984	116785
1985	113373
1986	108359
1987	100571
1988	90973
1989	81130
1990	73642
1991	70888
1992	72272
1993	77627
1994	83368
1995	53732
1996	45007
1999	2597
2000	3559
2001	3965
2002	3980
2003	3982
2004	6104
2005	10433
2006	12046
2007	11138
2008	7251
2009	4739
2010	4356
2011	3624
2012	3701
2013	1720
2014	1667
2015	1762
2016	1146