Year	per 1,000 people
1960	1.9222308122533984
1970	1.9006536019323366
1975	1.5716972228864425
1981	1.688514549544117
1990	1.7846693262821516
2000	1.6060451416536605
2001	1.5035815434923332
2002	1.58347605527817
2003	1.5790653491425897
2004	1.6124005889144537
2005	1.6285384923399369
2006	1.6574446394999627
2007	1.6255286490546021
2008	1.6474619609134733
2009	1.5441629876903933
2010	1.5527595524103348
2014	1.597108135641495
2015	1.4839953082924622
2016	1.4747310901965849
2017	1.3768023447529365