Year	cubic meters
1961	473.3695799183099
1962	455.9794209973312
1963	438.9380708546375
1964	423.70265274177984
1965	411.74726717456673
1966	402.33792822406315
1967	393.57284302403383
1968	384.74370298225836
1969	375.7737584300816
1970	366.6501324916443
1971	357.4492422076065
1972	347.77493595972965
1973	335.85125819477065
1974	321.1825390489143
1975	305.43131046176416
1976	290.0039771974016
1977	275.3948473624058
1978	261.5730179211148
1979	248.49862456011306
1980	236.26937408867525
1981	224.93464845124458
1982	214.36509499282948
1983	204.46361599162515
1984	196.37838973647982
1985	189.99471543270076
1986	184.20519406017195
1987	178.93939552738422
1988	174.0615904504838
1989	169.48980179862576
1990	165.21189723914398
1991	161.21710624046085
1992	157.48669237449434
1993	154.0164181501748
1994	150.81994339512067
1995	147.89577066690217
1996	145.22622719273969
1997	142.78877908658424
1998	140.53510145228972
1999	138.39467710347057
2000	135.79602660826143
2001	132.6783822941836
2002	129.501902382946
2003	126.29358459261567
2004	123.07555977841476
2005	119.90436427905102
2006	117.18680027970814
2007	114.80722964086495
2008	112.38895569787921
2009	110.05958783313268
2010	107.82521471080969
2011	113.11975891916978
2012	119.25306693333924
2013	116.9547456977779
2014	114.79617774646574
2015	113.04480530858406
2016	111.42600453726689
2017	109.74778235007943
2018	108.0614956359365
2019	106.55969291323238
2020	105.20079676077728