Year	per 1,000 people
1960	0.391
1965	0.435
1970	0.527
1975	0.536
1980	1.065
1981	1.364
1982	1.365
1986	1.304
1990	0.76
1994	1.84
1996	2.02
1997	1.6
2000	2.118
2003	0.507
2014	0.745
2015	0.777
2016	0.778
2017	0.757
2018	0.73
2019	0.709