Year	cubic meters
1961	80937.55774858933
1962	78090.60860226794
1963	75401.34534683617
1964	72872.14936082097
1965	70504.43741202544
1966	68293.66760565423
1967	66234.40414240514
1968	64338.59638234891
1969	62570.32239773906
1970	60893.56182609553
1971	59302.45617128648
1972	57784.34371559467
1973	56324.071761851854
1974	54901.40824541415
1975	53507.588133626916
1976	52132.73640581229
1977	50772.14092189627
1978	49426.78056696454
1979	48100.29379489183
1980	46804.3986193945
1981	45540.020005368075
1982	44300.17484847772
1983	43088.13009717326
1984	41910.83747496477
1985	40772.68937019906
1986	39679.070063054605
1987	38637.82848565357
1988	37648.33192901724
1989	36700.21542701675
1990	35779.27417467822
1991	34882.85226895975
1992	34016.277842549185
1993	33182.86519064584
1994	32386.092666642206
1995	31627.359177084105
1996	30906.118153269184
1997	30218.581967636164
1998	29570.152045534895
1999	28963.738936748832
2000	28397.717828715522
2001	27879.055230628866
2002	27409.73404553363
2003	26977.923463869876
2004	26570.729872084274
2005	26182.335172352752
2006	25809.858543702714
2007	25450.341541331243
2008	25100.396030938795
2009	24763.720141911457
2010	24446.957889790516
2011	24145.680935980614
2012	23856.810158694236
2013	23583.25672253255
2014	23326.441367647836
2015	23083.639174529064
2016	22850.417727879834
2017	22627.868482823447
2018	22417.370168709556
2019	22224.267641544982
2020	22056.936174448892