Year	per 1,000 people
1960	4.58133935928345
1970	4.09870004653931
1990	1.6505999565
1992	3.0827000141
1997	2.7000000477
2000	3.07
2001	3
2002	3
2003	3
2004	3
2005	3.6
2006	3.6
2007	3.43
2008	3.43
2009	3.45
2010	3.45
2011	3.45
2012	3.45
2013	2.86
2014	2.85
2015	3.37
2016	2.73
2017	2.73