Year	per 1,000 people
1990	2.898
1991	2.985
1992	3.057
1993	3.133
1994	3.213
1995	2.191
1996	2.26
1997	2.295
1998	2.32
1999	2.401
2000	2.499
2001	2.5
2002	2.527
2003	2.564
2004	3.653
2005	3.674
2006	3.69
2007	3.729
2008	3.742
2009	3.775
2010	3.44
2011	3.543
2012	3.556
2013	3.387
2014	3.448
2015	3.421
2016	3.42
2017	3.461
2018	3.48
2019	4.296
2020	4.325