Year	per 1,000 people
1960	0.559
1965	0.473
1970	0.463
1979	0.516
1984	0.817
1990	1.1
1991	1.066
1992	0.99
2002	0.892
2003	0.946
2004	0.984
2005	0.981
2006	1.042
2007	1.039
2008	1.042
2009	1.033
2010	1.438
2011	1.591
2012	1.753
2013	1.887
2014	2.036
2015	2.159
2016	2.31
2017	2.455
2018	2.595
2019	2.649
2020	2.808
2021	2.973