Year	cubic meters
1961	28064.685435874075
1962	27628.295117766338
1963	27223.03872126644
1964	26835.342354200006
1965	26488.333076301165
1966	26167.085241542325
1967	25866.632591591977
1968	25594.94242492662
1969	25336.93927270289
1970	25037.989892921512
1971	24683.935015717412
1972	24418.986765163358
1973	24180.80721635151
1974	23949.77116073939
1975	23703.949051564978
1976	23471.45581100075
1977	23232.85572749513
1978	22989.419233365898
1979	22739.62363852722
1980	22515.233901402193
1981	22289.87004647898
1982	22073.289224088912
1983	21870.789774090754
1984	21680.58558603753
1985	21488.73436040587
1986	21289.600017620636
1987	21091.36258429712
1988	20892.714044537614
1989	20678.902751881466
1990	20438.91465785996
1991	20169.496362551607
1992	19895.72896968093
1993	19639.383497437684
1994	19402.542519715156
1995	19175.837459620237
1996	18956.25432280691
1997	18733.291823954598
1998	18522.320571089545
1999	18316.88354604369
2000	18117.41627066277
2001	17937.287281510755
2002	17768.89447305623
2003	17616.14004426052
2004	17453.742539837636
2005	17293.176620500242
2006	17126.396964288728
2007	16963.96032069822
2008	16801.97652902611
2009	16650.920657546383
2010	16508.75172822354
2011	16385.16341144907
2012	16259.740134411997
2013	16141.666694124777
2014	16019.427031615856
2015	15901.53874937349
2016	15780.276279451187
2017	15671.86616033857
2018	15575.244549132241
2019	15488.520393998228
2020	15337.341511758728