Year	Number
1971	59078
1972	57215
1973	61424
1974	64466
1975	66224
1976	62699
1977	65900
1978	68678
1979	73452
1980	78525
1981	81510
1982	86393
1983	97095
1984	99131
1985	104774
1986	107633
1987	104946
1988	103390
1989	106766
1990	117979
1991	120115
1992	119392
1993	134301
1994	147115
1995	118148
1996	120517
1997	124682
1998	112427
1999	119238
2000	122294
2001	119650
2002	118771
2003	124230
2004	132089
2005	131927
2006	134432
2007	135431
2008	131874
2009	127521
2010	130995
2011	128593
2012	125577
2013	130789
2014	126800
2015	124816
2016	127056
2017	126007