Year	National currency (Billions)
1980	0.006
1981	-0.003
1983	-0.003
1984	-0.021
1985	-0.029
1986	-0.037
1987	-0.103
1988	-0.080
1989	-0.079
1991	-0.005
1992	0.033
1993	0.021
1994	0.060
1995	0.053
1996	0.072
1997	0.042
1998	0.111
1999	-0.008
2000	-0.063
2001	-0.052
2002	-0.102
2003	0.279
2004	0.507
2005	0.481
2006	0.531
2007	0.727
2008	0.105
2009	0.139
2010	0.411
2011	0.499
2012	0.401
2013	0.349
2014	0.230
2015	0.123
2016	-0.346
2017	-0.105
2018	0.191
2019	-0.202
2020	-0.308
2021	-0.458
2022	-0.537
2023	-0.189
2024	-0.519
2025	-0.408
2026	-0.449
2027	-0.502
2028	-0.548
2029	-0.622