Year	per 1,000 people
1980	1.70000004768372
1985	2.40000009536743
1989	3
1990	3.0999999046
1991	3.2999999523
1992	3.5
1993	3.7000000477
1994	4.0999999046
1995	4.4000000954
1996	4.5999999046
1997	4.8000001907
1998	5.0999999046
1999	5.5999999046
2000	4.65
2001	4.45
2002	4.83
2003	5.09
2004	5.42
2005	5.9
2006	6.48
2007	7.24
2008	7.73
2009	8.19
2010	8.74
2011	9.53
2012	10.25
2013	10.92
2014	11.59
2015	11.61
2016	11.98
2017	12.27
2018	12.43