Year current international $ 2005 24480 2006 25060 2007 25860 2008 26030 2009 25510 2010 25860 2011 25940 2012 24600 2013 24150 2014 23820 2015 23690 2016 23200 2017 24040 2018 24480 2019 25500 2020 21950 2021 25460 2022 29470