Year current international $ 2000 35.750252261820265 2001 38.09394405093971 2002 38.178844139424406 2003 51.808461593654975 2004 50.356017352290046 2005 51.6988484827503 2006 54.93396390801458 2007 56.49410866757943 2008 57.52370408321929 2009 59.48685255962602 2010 57.32341633181945 2011 58.69137716477424 2012 58.10640402469689 2013 63.0191292240223 2014 62.2729981568626 2015 64.61472371226705 2016 66.4230485039498 2017 65.5668167340192 2018 58.6880794832468 2019 57.883074382732445 2020 58.613292392296806 2021 65.92545675990519