Year per 1,000 uninfected population ages 15-49 1990 4.92337525919656 1991 5.20269522297036 1992 5.27845599854763 1993 5.19878450022343 1994 4.97521921625274 1995 4.68851369446055 1996 4.3976090552545 1997 4.14166566825348 1998 3.88840957365308 1999 3.63539708767657 2000 3.40695386009439 2001 3.19610675116623 2002 3.00096495096829 2003 2.81787488094126 2004 2.67972558758356 2005 2.53928452713868 2006 2.41595615477978 2007 2.31546957529648 2008 2.24714121383658 2009 2.15036134858363 2010 2.07388139220088 2011 1.99599767786867 2012 1.92722737448753 2013 1.82778733723698 2014 1.75233987295181 2015 1.66691515849497 2016 1.59350261919458 2017 1.51401524115593 2018 1.44836812201592