Year	per Person
1970	1.02195
1971	1.07979
1972	1.09253
1973	1.14461
1974	1.16936
1975	1.25766
1976	1.35857
1977	1.4253
1978	1.42244
1979	1.3484
1980	1.38276
1981	1.44724
1982	1.45673
1983	1.4401
1984	1.42458
1985	1.35632
1986	1.36659
1987	1.29285
1988	1.26087
1989	1.12719
1990	0.97538
1991	0.85516
1992	0.75351
1993	0.72067
1994	0.64128
1995	0.62904
1996	0.60357
1997	0.52614
1998	0.49648
1999	0.50215
2000	0.49566
2001	0.49035
2002	0.48498
2003	0.47996
2004	0.48061
2005	0.45268
2006	0.45041
2007	0.4389
2008	0.43392
2009	0.43353
2010	0.42196
2011	0.42709
2012	0.44715
2013	0.4288
2014	0.43887
2015	0.44199
2016	0.41641