Year	U.S. dollars (Billions)
1994	-0.840
1995	-1.040
1996	-1.056
1997	-1.181
1998	-1.076
1999	-1.485
2000	-0.857
2001	-0.828
2002	-0.486
2003	-1.071
2004	-1.588
2005	-1.365
2006	-1.234
2007	-0.419
2008	0.381
2009	-1.137
2010	-1.307
2011	-2.070
2012	-1.821
2013	-1.997
2014	-1.901
2015	-1.939
2016	-2.143
2017	-2.130
2018	-2.140
2019	-1.780
2020	-1.904
2021	-1.778
2022	-2.037
2023	-2.446