Year	cubic meters
1961	52496.41611005403
1962	51472.1312347033
1963	50299.2992552203
1964	49134.220832945626
1965	47978.18521547829
1966	46830.13184483273
1967	45689.711296253925
1968	44555.47589246822
1969	43428.24127394598
1970	42307.30070588104
1971	41192.93533614492
1972	40091.23767084301
1973	39007.311084591856
1974	37944.613928842315
1975	36904.77365274933
1976	35930.375618515754
1977	35014.25259640943
1978	34068.45063050968
1979	33117.49541480391
1980	32042.663456609953
1981	30920.660981795543
1982	30175.795563295887
1983	29543.30594138608
1984	28710.94181354294
1985	27845.055829846922
1986	26995.72577563763
1987	26164.70056033671
1988	25372.754104647087
1989	24618.498935272466
1990	23883.42787554722
1991	23179.360961150458
1992	22508.77347467194
1993	21863.13469460845
1994	21247.01782928325
1995	20663.585698285762
1996	20110.017263676356
1997	19582.27211883986
1998	19071.43888557409
1999	18572.726135356534
2000	18089.54044218258
2001	17620.573290838278
2002	17154.67097498164
2003	16692.83099774335
2004	16240.906059327375
2005	15803.027362218296
2006	15379.12673938346
2007	14957.374769242771
2008	14539.001030032305
2009	14130.96579095053
2010	13733.751161332035
2011	13350.368990995248
2012	12979.798488866185
2013	12619.696433895673
2014	12242.380295418054
2015	11863.042607095247
2016	11513.337547861534
2017	11191.652290039581
2018	10886.579507302122
2019	10588.64282339606
2020	10305.35289095536