Year	per 1,000 people
1960	0.02
1965	0.041
1970	0.066
1976	0.051
1985	0.729
1990	0.234
1995	0.336
2000	0.279
2004	0.347
2005	0.268
2009	0.197
2010	0.332
2012	0.321
2013	0.326
2014	0.378
2015	0.4
2016	0.372
2017	0.441
2018	0.362
2019	0.364
2020	0.357
2021	0.327