Year	Number
1970	67700
1971	67600
1972	67600
1973	72400
1974	69700
1975	79700
1976	88300
1977	100800
1978	105700
1979	112800
1980	116600
1981	122800
1982	116700
1983	121300
1984	119100
1985	122300
1986	109400
1987	103600
1988	98300
1989	91400
1990	85000
1991	94700
1992	81900
1993	68900
1994	70100
1995	66400
1996	62100
1997	78000
1998	78400
1999	69400
2000	71122
2001	60104
2002	52346
2003	49482
2004	56301
2010	120773.31996851471
2011	138169.49789716364
2012	146632.96028827317
2013	155038
2014	145526.8233093528
2015	164614
2016	157788
2017	151203
2018	157126.726523888
2019	158874.79
2020	92611.349
2021	134532.013