Year	constant 2015 US$
1998	9018145205.830078
1999	8084323303.897572
2000	8352134713.140754
2001	9695286220.969608
2002	10169941760.084755
2003	11890932713.512764
2004	14093936959.790663
2005	15699391986.794432
2006	14231060758.940971
2007	18944263952.56502
2008	23056341489.291492
2009	20456797649.41779
2010	24643858122.57516
2011	28848755974.774685
2012	34556085278.99591
2013	40113446638.25938
2014	36906101107.32353
2015	36777113133.94018
2016	32375463295.231964
2017	36840312060.65813
2018	35229257453.33995
2019	34036766229.530804
2020	31001473042.2727
2021	31846811007.54819