Year	per 1,000 people
1990	2.298
1995	2.778
1997	2.579
1998	2.792
1999	2.784
2000	3.34
2004	3.543
2005	3.688
2006	3.755
2007	3.989
2008	4.237
2009	4.486
2010	4.464
2011	4.44
2012	4.42
2013	4.436
2014	4.688
2015	4.612
2016	4.493
2017	4.39
2018	4.405
2019	4.415
2020	4.426