Year	Total
1967	2822900
1968	11968000
1969	16195000
1970	16442000
1971	14560000
1972	14004000
1973	14511000
1974	14362000
1975	16888000
1976	18226000
1977	16839000
1978	15551000
1979	14610000
1980	14117000
1981	16307000
1982	16703000
1983	19328000
1984	20754000
1985	24789000
1986	27860000
1987	29012000
1988	30929000
1989	32060000
1990	34239000
1991	35315000
1992	37038000
1993	38787000
1994	40453000
1995	42807000
1996	44365000
1997	44910000
1998	44712000
1999	44698000
2000	47025000
2001	46895000
2002	44012000
2003	40225000
2004	38430000
2005	37999000
2006	36180000
2007	34838000
2008	37071000
2009	39660000
2010	42202000
2011	43213000
2012	45000000
2013	46082000
2014	46219000
2015	48031000
2016	49316000