Year	cubic meters
1961	84683.64929552267
1962	82153.05048618134
1963	79692.67736480023
1964	77295.67562833354
1965	74953.32510914799
1966	72655.71257342433
1967	70396.54330935408
1968	68175.27167983241
1969	66005.10851905764
1970	63895.65958637367
1971	61853.563736967335
1972	60007.32949136864
1973	58227.630111971055
1974	56409.56936831466
1975	54667.41278358655
1976	52998.282585580644
1977	51407.18996406334
1978	49930.574733805886
1979	48598.28436016304
1980	47288.945720790885
1981	45975.77331921773
1982	44734.88117950483
1983	43577.96245616678
1984	42511.89481238405
1985	41511.71634378005
1986	40552.780530304
1987	39632.49179302203
1988	38730.158572738736
1989	37828.30969861098
1990	36948.11983480849
1991	36098.81383009085
1992	35284.37566916307
1993	34508.666267994115
1994	33773.236531567956
1995	33081.81889223663
1996	32459.955976145746
1997	31905.884890446454
1998	31401.822716899936
1999	30933.42056976426
2000	30490.577999547942
2001	30082.245216612966
2002	29703.33177030032
2003	29345.891518828827
2004	29001.769885873644
2005	28637.80410136034
2006	28248.7050642418
2007	27857.567419646675
2008	27464.31625614655
2009	27069.79244412967
2010	26676.416654171793
2011	26286.681835231426
2012	25902.865167635697
2013	25527.100053779966
2014	25159.95358752816
2015	24800.757247882782
2016	24448.936375012036
2017	24104.502531582282
2018	23768.17742158563
2019	23441.143686512634
2020	23122.028983576565