Year	per 1,000 people
1960	0.891
1970	1.072
1971	1.026
1975	1.276
1981	1.172
1982	1.266
1984	1.38
1987	2.032
1990	2.189
1991	2.373
1992	2.353
1993	2.425
1997	2.379
1998	2.507
2000	2.565
2001	3.036
2002	3.217
2003	3.082
2008	3.324
2009	1.899
2010	2.13
2011	2.207
2012	2.312
2013	2.395
2014	2.563
2015	2.716
2021	5.485