Year	Per 100 People
1960	0.54783
1975	0.60528
1976	0.58903
1977	0.68623
1978	0.66601
1981	0.8231
1982	1.23802
1983	1.55007
1984	1.73184
1985	1.80829
1986	1.89715
1987	1.97086
1988	2.04622
1989	1.97085
1990	1.93164
1991	1.90724
1992	1.98626
1993	1.96529
1994	1.9843
1995	1.97621
1996	2.0152
1997	3.27976
1998	3.21921
1999	3.33073
2000	3.32886
2001	3.84192
2002	4.39371
2003	4.69765
2004	4.6391
2005	4.56981
2006	4.76564
2007	4.6928
2008	4.57903
2009	4.50434
2010	4.46514
2011	4.4519
2012	4.39338
2013	3.72958
2014	3.55526
2015	3.29374
2016	2.86779
2017	2.72553