Year % of population 2000 99.3 2001 99.3 2002 99.3 2003 99.2 2004 99.9 2005 99.2 2006 99.4 2007 97.8 2008 99.9 2009 99.3 2010 99.5 2011 99.7 2012 99.5 2013 99.6 2014 99.7 2015 99.7 2016 99.8 2017 99.9 2018 99.7 2019 100 2020 100 2021 100 2022 100