Year	per 1000 people
1980	0.241
1981	0.247
1986	1.056
1989	0.391
1990	0.404
1991	0.407
1992	0.437
1997	0.569
1998	0.48
1999	0.515
2001	0.522
2002	0.549
2005	0.611
2006	0.621
2007	0.639
2008	0.662
2009	0.695
2010	0.695
2011	1.152
2012	0.816
2013	1.18
2014	0.777
2015	0.79
2016	0.821