Year	per 1000 people
1990	1
1991	1.1
1992	1.3
1993	1.4
1994	1.5
1995	1.6
1996	1.6
1997	1.4
1998	1.2
1999	1.7
2000	1.905
2001	1.5
2002	1.5
2003	1.5
2004	2.893
2005	1.749
2006	1.864
2007	1.888
2008	1.925
2009	1.959
2010	1.922
2011	2.019
2012	2.029
2013	2.071
2014	2.118
2015	2.231