Year current international $ 1990 18624.951803873035 1991 19537.502186177193 1992 20135.76514134892 1993 20424.768605500114 1994 21305.301345994994 1995 22379.64206256744 1996 23050.914475922076 1997 23871.41571268712 1998 25020.908880982686 1999 25602.389472039285 2000 27075.850554260873 2001 28042.01264820018 2002 28736.577107350364 2003 29198.539405998057 2004 29555.556467149403 2005 30130.644456912836 2006 32453.386504609403 2007 34148.964000972366 2008 35523.27131043416 2009 34601.91002857763 2010 35152.394639912614 2011 36598.01496930241 2012 36486.296787030224 2013 36314.69710077751 2014 36194.87391884304 2015 36899.38520924635 2016 39926.95466285921 2017 41581.12079054799 2018 43036.24377703666 2019 46470.03732657535 2020 44202.23557692104 2021 49901.61213674287 2022 55908.25546929227 2023 58754.90787787213