Year	per 1,000 people
1990	2.845
1991	4.136
1992	4.206
1993	4.259
1994	4.239
1995	4.323
1996	3.408
1997	3.485
1998	3.469
1999	3.518
2000	3.682
2001	4.022
2002	4.228
2003	4.442
2004	4.453
2005	4.514
2006	4.609
2007	4.759
2008	4.978
2009	5.113
2010	5.313
2011	5.386
2012	5.416
2013	5.323
2014	5.334
2015	5.472
2016	5.705
2017	5.931
2018	6.067
2019	6.094
2020	6.306