Year	National currency (Billions)
1985	-0.012
1986	-0.015
1987	0.006
1988	0.024
1989	0.012
1990	0.005
1991	-0.007
1992	-0.012
1993	-0.005
1995	-0.003
1996	-0.012
1997	-0.024
1998	0.053
1999	0.040
2000	-0.029
2001	-0.074
2002	-0.075
2003	-0.086
2004	-0.076
2005	-0.189
2006	-0.173
2007	-0.058
2008	-0.028
2009	-0.101
2010	-0.167
2011	-0.228
2012	-0.329
2013	-0.217
2014	-0.146
2015	-0.115
2016	-0.069
2017	-0.120
2018	-0.058
2019	-0.199
2020	-0.498
2021	-0.289
2022	-0.092
2023	-0.144
2024	-0.168
2025	-0.169
2026	-0.169
2027	-0.184
2028	-0.199
2029	-0.215