Year	per 1,000 people
1960	0.374
1965	0.4
1970	0.492
1975	0.624
1981	0.767
1984	0.927
1985	1.467
1988	1.185
1990	1.074
1992	1.128
1993	1.155
1994	1.184
1995	1.214
1996	1.245
1997	1.281
1998	1.267
1999	1.364
2011	1.843
2013	1.876
2017	2.158
2019	2.303
2021	2.142