Year	cubic meters
1961	61885.10230743275
1962	59932.55042251421
1963	58299.70060568863
1964	56723.577830035
1965	55208.339263472175
1966	53761.183943440854
1967	52380.498024979555
1968	51060.22445141082
1969	49794.46797082656
1970	48577.8504756215
1971	47405.060252893585
1972	46270.058264440515
1973	45169.87987189045
1974	44106.07162621036
1975	43080.96492198791
1976	42093.13670605681
1977	41128.79962478161
1978	40185.42017822038
1979	39274.9979609449
1980	38405.61156984991
1981	37586.77255595605
1982	36802.499918268746
1983	36038.067941898706
1984	35301.400650692834
1985	34595.32510356266
1986	33918.295204318296
1987	33267.16614068782
1988	32636.89627851666
1989	32028.687189146636
1990	31433.70509184775
1991	30857.153303710344
1992	30307.3075780855
1993	29778.56975869865
1994	29268.62293920772
1995	28778.656963496458
1996	28310.60964058429
1997	27861.847279797494
1998	27431.493274033262
1999	27019.74182747904
2000	26627.141841888177
2001	26253.76924361577
2002	25898.688800099066
2003	25562.946523478935
2004	25241.299737169484
2005	24931.233784107077
2006	24635.582963911518
2007	24352.668577937442
2008	24081.742460128426
2009	23819.282235576276
2010	23571.121283943
2011	23308.418680460596
2012	23051.795263935852
2013	22805.54657517416
2014	22568.09066108623
2015	22337.74229063359
2016	22114.329886293002
2017	21900.444230903042
2018	21700.689958552088
2019	21509.967217094378
2020	21336.580016877735