Year	per 1,000 people
1960	0.121
1965	0.588
1975	0.435
1984	0.564
1988	1.074
1990	1.49
1993	1.054
1995	1.5
1997	2.156
2000	1.835
2008	1.091
2011	1.513
2018	1.392
2019	1.433