Year	per 1,000 people
1980	2.938
1985	3.35
1986	3.408
1987	3.484
1990	3.5
1991	3.526
1992	3.249
1993	3.185
1994	3.171
1995	3.156
1996	3.107
1997	3.189
1998	2.947
1999	2.993
2000	2.942
2001	2.783
2002	2.965
2003	2.996
2004	3.024
2005	3.142
2006	3.183
2007	3.26
2008	3.343
2009	3.28
2010	3.244
2011	3.294
2012	3.283
2013	3.335
2014	3.361
2015	3.417
2016	3.456
2017	3.468
2018	3.483
2019	3.469
2020	3.863