Year	per 1,000 people
1990	2.494
1991	2.429
1992	2.596
1993	2.613
1994	2.639
1995	2.682
1996	2.703
1997	2.78
1998	2.858
1999	2.884
2000	2.912
2001	2.932
2002	3.035
2003	3.078
2004	3.22
2005	3.324
2006	3.411
2007	3.447
2008	3.573
2009	3.648
2010	3.724
2011	3.785
2012	3.831
2013	3.842
2014	3.872
2015	3.934
2016	4.013
2017	4.129
2018	4.215
2019	4.264