Year	per 1,000 people
1960	2.57554721832275
1970	2.09730005264282
1980	1.56410002708435
1989	1.25109994411469
1990	1.3667000532
1993	1.2999999523
1996	1.4600000381
2003	1.1000000238
2004	1.2
2006	1
2007	1
2010	1.48
2011	1.45
2012	1.48
2013	1.54
2014	1.59
2015	1.61
2016	1.68
2017	1.7
2018	1.71