Year	U.S. dollars (Billions)
1980	-4.175
1981	-4.772
1982	-12.126
1983	-4.714
1984	-0.756
1985	-0.352
1986	2.353
1987	-4.452
1988	-4.665
1989	-4.635
1990	-9.869
1991	-6.186
1992	3.835
1993	9.188
1994	8.170
1995	7.337
1996	19.361
1997	54.064
1998	55.507
1999	66.260
2000	15.021
2001	21.696
2002	17.225
2003	15.413
2004	11.288
2005	2.283
2006	5.877
2007	-2.712
2008	-20.406
2009	-14.840
2010	-16.645
2011	-24.622
2012	-25.909
2013	-14.341
2014	-27.309
2015	-8.976
2016	-12.028
2017	-19.889
2018	-23.208
2019	13.987
2020	-42.801
2021	10.660
2022	-56.769
2023	-22.734
2024	-18.092
2025	-17.728
2026	-15.073
2027	-15.222
2028	-9.219
2029	-4.242