Year	Number
1970	117756664
1971	121255752
1972	120127784
1973	112926160
1974	112041920
1975	109237136
1976	108771176
1977	111238080
1978	119027872
1979	119058120
1980	116343728
1981	112510064
1982	111431392
1983	110375672
1984	109213808
1985	105940320
1986	102318384
1987	101804704
1988	99238976
1989	96840024
1990	99978456
1991	99454320
1992	101764960
1993	102688944
1994	104175920
1995	108432800
1996	111860264
1997	113300424
1998	109274608
1999	102706656
2000	97077152
2001	93298528
2002	89839296
2003	79968736
2004	74767504
2005	69524456
2006	68417960
2007	60251056
2008	58508992
2009	59359360
2010	60300000
2011	59800000
2012	57900000
2013	56800000
2014	56200000
2015	57700000
2016	57300000
2017	57700000
2018	58000000