Year	cubic meters
1961	557.3556077405547
1962	538.2957019779676
1963	519.2944951537922
1964	500.5078068790627
1965	482.032054328226
1966	463.9261646044826
1967	446.0115970448758
1968	428.22105198924737
1969	410.61838615682234
1970	393.0437157959848
1971	375.19592262084353
1972	356.9165975140759
1973	338.5642449636452
1974	320.7052950849508
1975	303.8919441284531
1976	288.47693314402835
1977	274.12221213427097
1978	260.5703624664027
1979	247.8826176652308
1980	235.9485278286542
1981	224.75674998368171
1982	214.2636374787812
1983	204.32452864885298
1984	194.95772707234173
1985	186.1873067579398
1986	177.99732099198798
1987	170.33601191443623
1988	163.1131226885936
1989	156.31892891312035
1990	149.95536016372125
1991	144.10713500845068
1992	138.87803904208872
1993	134.48044404994357
1994	130.6653785964012
1995	127.0590380349642
1996	123.64582066822324
1997	120.37088073918956
1998	117.22997296872205
1999	114.233167028881
2000	111.38239944605819
2001	108.66647266682781
2002	106.08477986192624
2003	103.66791331651926
2004	101.4292737055427
2005	98.37015410176491
2006	94.55195570871221
2007	90.90885674991443
2008	87.47199483856915
2009	84.25842945025903
2010	81.59954418494618
2011	79.59949514020207
2012	77.86761357145552
2013	76.23283260432511
2014	74.70685962120385
2015	73.2827828697098
2016	71.82130141993706
2017	70.18955449578426
2018	68.53592108979653
2019	66.9879071755269
2020	66.67202450463589