Year	billion cubic meters
1961	108.77800000000003
1962	108.77800000000003
1963	108.77800000000003
1964	108.77800000000002
1965	108.77800000000003
1966	108.77800000000003
1967	108.77800000000002
1968	108.77800000000003
1969	108.77800000000003
1970	108.77800000000003
1971	108.77800000000003
1972	108.77800000000003
1973	108.77800000000003
1974	108.77800000000003
1975	108.77800000000003
1976	108.77800000000003
1977	108.77800000000003
1978	108.77800000000003
1979	108.77800000000003
1980	108.77800000000003
1981	108.77800000000003
1982	108.77800000000003
1983	108.77800000000002
1984	108.77800000000003
1985	108.77800000000003
1986	108.77800000000003
1987	108.77800000000003
1988	108.77800000000003
1989	108.77800000000003
1990	108.77800000000003
1991	108.77800000000003
1992	108.77800000000002
1993	108.77800000000003
1994	108.77800000000003
1995	108.77800000000003
1996	108.77800000000003
1997	108.77800000000003
1998	108.77800000000003
1999	108.77800000000003
2000	108.77800000000003
2001	108.77800000000003
2002	108.77800000000003
2003	108.77800000000003
2004	108.77800000000003
2005	108.77800000000003
2006	108.77800000000003
2007	108.77800000000003
2008	108.77800000000003
2009	108.77800000000003
2010	108.77800000000003
2011	108.77800000000003
2012	112.77800000000003
2013	112.77800000000003
2014	112.77800000000003
2015	112.77800000000003
2016	112.77800000000002
2017	112.77800000000002
2018	112.77800000000003
2019	112.77800000000003
2020	112.77800000000003