Year	per Person
1970	1.52026
1971	1.43672
1972	2.82249
1973	11.78648
1974	24.50535
1975	30.82804
1976	39.07885
1977	43.16456
1978	40.79291
1979	41.27766
1980	40.08786
1981	37.62401
1982	36.47733
1983	36.96685
1984	36.36122
1985	34.45696
1986	33.57983
1987	32.56432
1988	32.88909
1989	31.32629
1990	31.04121
1991	30.62259
1992	32.03717
1993	32.98302
1994	32.30118
1995	35.61671
1996	34.43726
1997	33.65295
1998	30.36758
1999	30.96948
2000	30.51245
2001	30.15727
2002	29.73186
2003	31.46391
2004	30.62113
2005	29.60089
2006	30.55503
2007	29.42134
2008	28.84098
2009	26.7685
2010	28.44116
2011	29.23508
2012	28.29032
2013	27.07805
2014	25.90939
2015	25.05137
2016	23.84474