Year	Total
1970	6939000
1971	6725000
1972	6684000
1973	8234000
1974	8702000
1975	8464000
1976	10492000
1977	11453000
1978	11557000
1979	12944000
1980	13325000
1981	13397000
1982	14295000
1983	14076000
1984	15570000
1985	15593000
1986	17167000
1987	16728000
1988	17125000
1989	17584000
1990	19769000
1991	19712000
1992	19456000
1993	20996000
1994	22208000
1995	24751000
1996	26758000
1997	27747000
1998	29102000
1999	24669000
2000	25132000
2001	26634000
2002	25574000
2003	22702000
2004	25565000
2005	24677000
2006	28334000
2007	32596000
2008	29487000
2009	27912000
2010	27557000
2011	24841000
2012	26529000
2013	25592000
2014	25774000
2015	29181000
2016	30865000