Year	per 1,000 people
1960	1.351
1965	1.667
1970	1.892
1975	1.869
1984	2.683
1985	2.705
1986	2.984
1988	3.032
1990	2.68
1992	2.645
1998	3.003
2001	3.2481
2004	3.1857
2013	3.9385
2015	3.973
2016	3.987
2017	3.979
2019	4.0685
2020	3.895