Year	Number
1970	43000000
1971	44100000
1972	45800000
1973	47600000
1974	49100000
1975	51200000
1976	53200000
1977	55300000
1978	57400000
1979	60300000
1980	63800000
1981	67100000
1982	71100000
1983	76600000
1984	80600000
1985	84800000
1986	88000000
1987	90800000
1988	93000000
1989	95000000
1990	99900000
1991	106000000
1992	111000000
1993	117000000
1994	121000000
1995	126000000
1996	130000000
1997	135000000
1998	137000000
1999	139000000
2000	144000000
2001	148000000
2002	154000000
2003	161000000
2004	167000000
2005	172000000
2006	176000000
2007	183000000
2008	190000000
2009	192000000
2010	201000000
2011	209000000
2012	217000000
2013	223000000
2014	233000000
2015	237000000
2016	241000000
2017	241000000
2018	245000000