Year current international $ 2000 29.488400594114932 2001 35.42225553861845 2002 36.796361494159854 2003 46.13406949812604 2004 56.71824859829842 2005 56.06791973458121 2006 55.74937694016076 2007 59.63344327356551 2008 57.96799294130732 2009 64.41317671907645 2010 59.028823953500876 2011 54.776987198503754 2012 50.97480104251882 2013 52.07456639567123 2014 52.924101777963024 2015 49.272899188224024 2016 59.735057765094595 2017 56.12255130179514 2018 58.22092106592726 2019 56.40341023425509 2020 61.243898911049925 2021 63.845434034069896