Year	per Person
1970	1.84619
1971	2.52329
1972	3.3279
1973	4.00471
1974	4.7021
1975	5.04805
1976	5.35071
1977	5.32948
1978	4.84723
1979	5.05246
1980	4.85849
1981	4.48686
1982	3.81778
1983	4.04521
1984	4.07466
1985	4.24406
1986	3.85866
1987	3.84229
1988	3.37071
1989	3.66092
1990	3.67079
1991	4.11908
1992	4.11991
1993	4.17369
1994	3.91623
1995	3.93448
1996	4.426
1997	3.89646
1998	3.69518
1999	3.41776
2000	3.27687
2001	3.4981
2002	3.36541
2003	3.22277
2004	3.78052
2005	3.43664
2006	3.36905
2007	3.29756
2008	3.61398
2009	3.39299
2010	3.80251
2011	3.44918
2012	3.42002
2013	3.66788
2014	3.08573
2015	2.30268
2016	2.12729