Year	U.S. dollars (Billions)
1994	2.843
1995	3.283
1996	3.410
1997	3.760
1998	4.068
1999	4.271
2000	4.314
2001	4.004
2002	3.556
2003	3.968
2004	4.603
2005	5.126
2006	5.348
2007	5.816
2008	7.310
2009	8.086
2010	9.682
2011	11.186
2012	12.208
2013	13.516
2014	13.990
2015	13.972
2016	15.405
2017	16.128
2018	16.277
2019	17.134
2020	15.532
2021	18.109
2022	19.166
2023	18.602