Year	cubic meters
1961	9730.87243563072
1962	9679.10353233453
1963	9450.377720250775
1964	9235.223231357202
1965	9024.25803354782
1966	8797.800338144321
1967	8587.860537337185
1968	8379.594488077608
1969	8169.034912008219
1970	7963.580107620239
1971	7757.04190552454
1972	7576.3324630043635
1973	7409.283774343032
1974	7257.205424103552
1975	7125.007202612989
1976	7007.686823017614
1977	6900.23390556053
1978	6794.922900240578
1979	6692.112825567232
1980	6594.267887407321
1981	6496.026993210504
1982	6391.497929056523
1983	6290.439182864502
1984	6197.228632468591
1985	6104.914827619438
1986	6010.428271525139
1987	5913.6327171408
1988	5818.896456574318
1989	5728.867936028514
1990	5643.080265782513
1991	5562.158115862859
1992	5487.880613145402
1993	5417.78652923517
1994	5350.113523253309
1995	5285.718086499896
1996	5223.75948506636
1997	5163.7969765282205
1998	5107.442967720365
1999	5056.218284351702
2000	5008.835924099033
2001	4964.190810079044
2002	4922.428262210309
2003	4883.098749637703
2004	4845.910764288848
2005	4809.622421255885
2006	4773.8775687719
2007	4738.990144033669
2008	4704.559034275016
2009	4671.615057441814
2010	4639.669756077335
2011	4606.513891362193
2012	4569.842054885841
2013	4534.2312151390215
2014	4500.2271474562385
2015	4468.137623154879
2016	4436.542150253203
2017	4405.031033733519
2018	4378.021721017074
2019	4354.657443524102
2020	4335.800779055345