Year current international $ 1990 5541.292777776655 1991 5731.814469059717 1992 5888.3737094083235 1993 6047.609444407617 1994 6276.259015557362 1995 6529.194957796862 1996 6822.465964870717 1997 7127.549223681892 1998 7271.066196889773 1999 7512.358886741811 2000 7981.813000490013 2001 8263.528831935424 2002 8531.684535909051 2003 8892.378591066483 2004 9494.720767834846 2005 10101.904245542668 2006 10966.176786151966 2007 11707.012012740182 2008 12205.506751833776 2009 12154.234036732149 2010 12816.271329208288 2011 13503.616368655856 2012 14074.971701508122 2013 14566.997448201426 2014 14998.81377122254 2015 15142.75338907101 2016 15570.450145202469 2017 16258.311971831446 2018 17098.940196973508 2019 17918.459226120845 2020 17656.617278860747 2021 19606.991434966778 2022 21523.43070074479 2023 22855.14872686727