Year current international $ 1990 6258.004725558658 1991 6582.029588863758 1992 6807.8478501619265 1993 6998.164240679539 1994 7360.349175591096 1995 7481.670670184517 1996 7762.301443919706 1997 8185.184410786454 1998 8358.378340958856 1999 8347.435970028155 2000 8722.793645488991 2001 8841.32649642649 2002 8874.608932022711 2003 9112.880555918135 2004 9789.366661695889 2005 10423.557431047388 2006 11334.402077824378 2007 12144.667538721356 2008 12771.525038368107 2009 12539.112308321584 2010 13340.99517252599 2011 14235.843094010042 2012 14546.130514094728 2013 15027.492206809218 2014 15340.002408747037 2015 15119.561935871941 2016 15372.52963992428 2017 16014.139086682897 2018 16694.91655015929 2019 17090.02636701569 2020 16423.948691551563 2021 18476.432186636477 2022 20627.19478708446 2023 21717.23717548847