Year per 1,000 uninfected population ages 15-24 1990 9.02 1991 14.16 1992 20.72 1993 27.79 1994 33.96 1995 37.93 1996 36.8 1997 34.99 1998 31.76 1999 28.99 2000 27.39 2001 26.08 2002 25.22 2003 24.62 2004 24.53 2005 24.33 2006 24.09 2007 23.17 2008 22.13 2009 21.04 2010 19.32 2011 18.63 2012 18.11 2013 17.88 2014 16.5 2015 14.8 2016 12.33 2017 10.13 2018 8.48 2019 7.69 2020 6.7 2021 5.63 2022 4.49