Year per 1,000 uninfected population ages 15-49 1990 5.72339108741148 1991 6.15541293237463 1992 6.39735755167474 1993 6.51384576632296 1994 6.52599766560472 1995 6.4547967447769 1996 6.34680483458729 1997 6.13961213970232 1998 5.85543246135549 1999 5.50646961652105 2000 5.16116024659958 2001 4.80674537380354 2002 4.48708324754998 2003 4.21289816490162 2004 4.00207355272515 2005 3.79051573565695 2006 3.58541054851916 2007 3.40683489493768 2008 3.25362109151867 2009 3.09351822123061 2010 2.94567215147762 2011 2.78281536812247 2012 2.62618336120999 2013 2.46215811758009 2014 2.33327438271814 2015 2.20687048004743 2016 2.09107993545958 2017 1.95498917071466 2018 1.82693205986816