Year	U.S. dollars (Billions)
1980	-2.192
1981	-2.392
1982	-1.889
1983	-1.878
1984	-2.132
1985	-3.276
1986	-1.676
1987	-1.223
1988	-0.958
1989	-2.561
1990	-3.537
1991	-1.573
1992	-2.144
1993	-0.747
1994	-0.146
1995	-3.214
1996	-5.094
1997	-5.331
1998	-3.795
1999	-5.347
2000	-7.836
2001	-9.388
2002	-9.659
2003	-12.738
2004	-13.325
2005	-18.220
2006	-29.710
2007	-44.399
2008	-51.535
2009	-35.972
2010	-29.861
2011	-28.716
2012	-6.202
2013	-6.171
2014	-5.872
2015	-2.894
2016	-4.583
2017	-5.143
2018	-7.589
2019	-4.584
2020	-13.840
2021	-15.258
2022	-23.390
2023	-16.539
2024	-16.343
2025	-13.869
2026	-12.082
2027	-10.163
2028	-8.981
2029	-8.832