Year	Number
1970	128800
1971	182700
1972	191500
1973	150000
1974	160000
1975	302100
1976	359300
1977	424800
1978	429600
1979	454600
1980	466300
1981	440300
1982	413900
1983	446700
1984	605000
1985	733600
1986	614500
1987	298700
1988	350500
1989	479500
1990	718000
1991	264200
1992	322900
1993	327900
1994	300200
1995	67400
1996	29500
1997	33600
1998	33500
1999	10400
2010	19167
2011	28232.1
2012	28442.05
2013	20004
2014	16128
2015	14463
2016	11903
2019	113752
2020	31391
2021	69447