Year constant 2021 international $ 1990 28729.24460199602 1991 28219.057526560282 1992 27285.574256360585 1993 26614.87333588387 1994 26275.729071892896 1995 26594.507757354007 1996 26886.87165552812 1997 27596.88388207202 1998 28098.652655141545 1999 28877.74670616999 2000 30236.48206212982 2001 30974.475953437584 2002 31570.513155106022 2003 32292.345406634493 2004 33475.24930678291 2005 34460.77671850169 2006 35936.70605968893 2007 37406.05474210235 2008 37877.37790972872 2009 35894.31242294093 2010 36788.05505614689 2011 37726.91995499796 2012 37862.549633894305 2013 38092.57414272759 2014 38544.14244181726 2015 38971.615474635604 2016 39490.12303450155 2017 40526.30256395752 2018 41345.56345447386 2019 42028.19153701584 2020 39873.69535610691 2021 42412.40386035862 2022 43538.862030129414 2023 44035.59088454026