Year	Number
1970	78905
1971	88568
1972	89306
1973	90589
1974	75634
1976	76991
1977	76730
1978	94150
1979	93578
1980	94956
1981	97094
1982	89034
1983	93321
1984	93340
1985	88625
1986	89112
1987	85300
1988	82822
1989	86540
1990	92097
1991	88545
1992	88933
1993	98153
1994	95275
1995	99623
1996	99701
1998	128975
1999	142627
2000	70795
2001	70294
2002	69075
2003	69147
2004	78084
2005	81193
2006	80273
2007	89171
2008	84753
2009	81992
2010	73967
2011	68407
2012	63590
2013	70451
2014	68338
2015	68547
2016	67665