Year current international $ 1990 3196.4815566728316 1991 3376.2179624916907 1992 3543.575085601315 1993 3732.5736575344586 1994 3925.247338486245 1995 4134.154240386899 1996 4408.52132304364 1997 4680.503151694195 1998 4692.641181783762 1999 4856.681190265232 2000 5219.171149215188 2001 5471.803245504295 2002 5769.335250927884 2003 6155.04226792623 2004 6762.690999468268 2005 7409.219432436265 2006 8236.647493056355 2007 9164.769282292897 2008 9865.44818684073 2009 10185.778814791147 2010 11084.82559902979 2011 11996.630732726804 2012 12694.531852455375 2013 13329.185530683813 2014 13800.453830431486 2015 13920.738163457629 2016 14437.712487630382 2017 15196.99570139013 2018 16165.864520326531 2019 17027.965098341956 2020 17139.0080689923 2021 19296.589692195957 2022 21411.87831065909 2023 23158.187146212393