Year	per Person
1970	3.18473
1971	4.74879
1972	4.03895
1973	3.93279
1974	3.31803
1975	2.69517
1976	2.69885
1977	4.69178
1978	6.02984
1979	5.77602
1980	6.49281
1981	7.11393
1982	7.18762
1983	6.0045
1984	7.50866
1985	8.55971
1986	9.30433
1987	9.73975
1988	9.43564
1989	10.44507
1990	9.72973
1991	10.87752
1992	9.56227
1993	9.37345
1994	10.38096
1995	11.51085
1996	11.83188
1997	12.10329
1998	11.75521
1999	11.59274
2000	10.9486
2001	12.16044
2002	11.13442
2003	10.77278
2004	10.19122
2005	9.39195
2006	8.37671
2007	7.4885
2008	6.55848
2009	5.7336
2010	5.58043
2011	5.42832
2012	5.49073
2013	5.4562
2014	5.38207
2015	5.91667
2016	6.00629