Year	per 1,000 people
1970	1.8130614667996483
1975	2.0802127898951936
1980	2.7957489229013803
1985	2.8422985569286863
1987	3.233370381032962
1989	2.935707458246974
1990	2.830329984687301
1991	2.8939085111671856
1992	2.860737919694298
1993	2.925202282616431
1994	2.833312398620262
1995	3.0629559639580637
1996	2.880560991486133
1998	2.5572182064651217
1999	2.8016874845506172
2000	2.185398202470638
2001	2.113484779090945
2002	1.9935594947557553
2003	2.1114248173475767
2004	2.112088546555796
2005	2.254365238050661
2006	2.2418201089766208
2007	2.2548170498349327
2008	2.3619130798279135
2009	2.277580477554639
2010	2.38771216528946
2011	2.496539924367065
2012	2.68387281787634
2013	2.8693167500787093
2014	2.9621224742888126
2015	2.9142251391235683
2016	3.0765013510822685
2017	3.2464838131416163