Year	Per 100 People
1970	25.01293
1975	33.02322
1976	34.4646
1977	35.69967
1978	36.68777
1979	37.48182
1980	38.8077
1981	40.42099
1982	41.43315
1983	42.89184
1984	44.27455
1985	45.99186
1986	47.79829
1987	49.67988
1988	52.00925
1989	54.62738
1990	57.52948
1991	60.11749
1992	62.56568
1993	63.22404
1994	61.10324
1995	63.67204
1996	63.57861
1997	62.10189
1998	61.07866
1999	60.17599
2000	60.30163
2001	59.69529
2002	58.56605
2003	57.98199
2004	57.75523
2005	57.41421
2006	56.29007
2007	55.42721
2008	55.14758
2009	54.80065
2010	54.43991
2011	54.04809
2012	50.54043
2013	49.68236
2014	48.59806
2015	46.34922
2016	43.50077
2017	41.80159