Year per 1,000 uninfected population ages 15-49 1990 4.11768224072907 1991 4.27517395322513 1992 4.18478884498398 1993 3.93783203469389 1994 3.65425818401895 1995 3.38062292131825 1996 3.1503877687805 1997 2.96571853513181 1998 2.81197992062682 1999 2.69272389999331 2000 2.54985411623829 2001 2.40775404558331 2002 2.23928632205021 2003 2.11959697415414 2004 1.98841758946819 2005 1.88102460793781 2006 1.7621422292468 2007 1.67286820110764 2008 1.60845417769669 2009 1.54654572944374 2010 1.50382390010402 2011 1.44839209389898 2012 1.40876436025292 2013 1.35472746608296 2014 1.31108784716396 2015 1.24840571940462 2016 1.21200800233355 2017 1.15174490676494 2018 1.10224746593698