Year World Bank (% of population) 2009 4.9 2010 4.9 2011 6.4 2012 7.2 2013 6.7 2014 6.1 2015 5.9 2016 5.5 2017 5.2 2018 3.8 2019 3.4 2020 3.5 2021 2.8 2022 2.5