Year	per 1,000 people
1960	0.061
1965	0.106
1970	0.134
1981	0.55
1986	1.346
1990	1.433
1993	1.335
1997	1.66
2000	0.694
2001	0.655
2008	1.673
2009	1.647
2010	1.92
2011	1.966
2012	1.996
2013	2.159
2014	2.14
2015	2.237
2016	2.267
2017	2.409
2018	2.514
2019	2.633
2020	2.648
2021	2.789