Year % of population ages 15-49 1990 0.2 1991 0.2 1992 0.2 1993 0.3 1994 0.3 1995 0.4 1996 0.4 1997 0.5 1998 0.6 1999 0.7 2000 0.7 2001 0.7 2002 0.7 2003 0.7 2004 0.7 2005 0.7 2006 0.7 2007 0.6 2008 0.6 2009 0.6 2010 0.6 2011 0.5 2012 0.5 2013 0.5 2014 0.5 2015 0.4 2016 0.4 2017 0.4 2018 0.4 2019 0.4 2020 0.3 2021 0.3 2022 0.3