Year per 1,000 uninfected population ages 15-24 1990 18.24 1991 20.08 1992 20.26 1993 18.87 1994 16.53 1995 13.65 1996 11.56 1997 9.84 1998 8.44 1999 7.51 2000 6.74 2001 6.05 2002 5.48 2003 4.94 2004 4.69 2005 4.34 2006 4.03 2007 3.79 2008 3.58 2009 3.44 2010 3.21 2011 2.92 2012 2.64 2013 2.45 2014 2.19 2015 1.91 2016 1.61 2017 1.36 2018 1.19 2019 1.13 2020 1.08 2021 0.94 2022 0.74