Year	National currency (Billions)
1980	-0.007
1981	-0.007
1982	0.001
1983	-0.006
1984	0.009
1985	0.017
1986	0.010
1987	0.005
1988	0.003
1989	-0.012
1990	0.012
1991	-0.004
1992	-0.026
1993	-0.012
1994	0.001
1995	0.010
1996	0.015
1997	-0.028
1998	-0.020
1999	-0.022
2000	-0.009
2001	-0.020
2002	-0.026
2003	-0.034
2004	-0.040
2005	-0.067
2006	-0.054
2007	-0.059
2008	-0.026
2009	-0.055
2010	-0.072
2011	-0.067
2012	-0.035
2013	-0.120
2014	-0.059
2015	-0.043
2016	0.024
2017	-0.008
2018	-0.010
2019	-0.054
2020	-0.112
2021	-0.172
2022	-0.245
2023	-0.301
2024	-0.225
2025	-0.110
2026	0.011
2027	0.034
2028	0.047
2029	0.060