Year	per Person
1970	2.45458
1971	2.36413
1972	2.61876
1973	2.75943
1974	2.73415
1975	2.82065
1976	3.19314
1977	3.27735
1978	3.46122
1979	4.32875
1980	2.66994
1981	2.92171
1982	2.18882
1983	2.29781
1984	2.37826
1985	2.17367
1986	2.80866
1987	2.21432
1988	3.0193
1989	3.50226
1990	1.79604
1991	0.22106
1992	1.23013
1993	2.74486
1994	3.2291
1995	5.18424
1996	5.13072
1997	4.86383
1998	4.65161
1999	3.97329
2000	4.21311
2001	4.05337
2002	3.65653
2003	4.14915
2004	4.44306
2005	4.86247
2006	4.69827
2007	4.04808
2008	4.3094
2009	3.66805
2010	3.52225
2011	3.81692
2012	4.11243
2013	4.07961
2014	3.57599
2015	3.86656
2016	3.80276