Year	per 1,000 people
1991	0.725
1993	0.808
1995	0.913
1997	0.924
1998	1.032
1999	1.089
2001	1.226
2002	1.319
2004	1.481
2006	1.533
2007	1.514
2008	1.565
2009	1.619
2010	2.032
2015	2.315
2016	2.708
2017	2.887
2018	2.693
2019	3.078