Year constant 2021 international $ 1990 5733.277433340822 1991 5961.634370049007 1992 6193.690158794799 1993 6436.423918828939 1994 6747.65994442343 1995 7096.050032052191 1996 7450.281794943699 1997 7694.402423555038 1998 7602.520585172066 1999 7837.972515285259 2000 8215.863920932863 2001 8446.477624021076 2002 8795.345335659626 2003 9212.500705776409 2004 9731.13410306104 2005 10287.310908551617 2006 10941.418569784577 2007 11752.332196666692 2008 12254.220510448873 2009 12581.53232819487 2010 13508.45639391686 2011 14215.108669716405 2012 14898.548781533793 2013 15608.604223306947 2014 16293.622489953006 2015 16996.652628371827 2016 17724.278406862162 2017 18549.007180759338 2018 19383.226568935122 2019 20123.940260720043 2020 20011.219170436405 2021 21207.861667498903 2022 21835.270204133034 2023 22714.448006392522