Every two years modeled estimate, % of children under 5 2000 3.9 2001 3.8 2002 3.6 2003 3.5 2004 3.4 2005 3.2 2006 3.1 2007 3 2008 2.9 2009 2.7 2010 2.6 2011 2.5 2012 2.4 2013 2.4 2014 2.3 2015 2.2 2016 2.2 2017 2.1 2018 2 2019 2 2020 1.9 2021 1.8 2022 1.8