Year	per 1,000 uninfected population ages 15-49
1990	1.6
1991	1.7
1992	2
1993	2.1
1994	2.3
1995	2.3
1996	2.3
1997	2.2
1998	2.1
1999	2
2000	1.9
2001	1.8
2002	1.7
2003	1.6
2004	1.5
2005	1.4
2006	1.4
2007	1.3
2008	1.4
2009	1.3
2010	1.2
2011	1.1
2012	1.1
2013	1
2014	1
2015	1
2016	0.9
2017	0.9
2018	0.8