Year	cubic meters
1961	34404.28194902234
1962	33291.40019993973
1963	32345.37423969781
1964	31521.25374881002
1965	30685.88237783844
1966	29852.129022960402
1967	29043.638066194453
1968	28283.34712281962
1969	27577.74666035865
1970	26895.848146659657
1971	26209.14141714635
1972	25516.283128091007
1973	24816.213830190063
1974	24114.251661319493
1975	23423.44404051717
1976	22758.723523364315
1977	22130.140488236684
1978	21536.412627764144
1979	20996.133815359517
1980	20497.355369953704
1981	20008.9580335104
1982	19530.84442279339
1983	19060.419887905013
1984	18593.200017952055
1985	18127.416988931855
1986	17665.763749852784
1987	17214.92236960438
1988	16781.023555638494
1989	16408.708875083987
1990	16100.429668650379
1991	15817.628201194777
1992	15560.06857161253
1993	15328.296431634253
1994	15120.507840504712
1995	14933.48163825443
1996	14764.32447063745
1997	14610.976454075559
1998	14468.964072065419
1999	14329.904039056399
2000	14198.40806469578
2001	14074.248129803393
2002	13950.037220142409
2003	13828.98316440515
2004	13711.859458168781
2005	13597.70714524344
2006	13481.881977745596
2007	13355.628533916579
2008	13212.41192199969
2009	13049.773260189602
2010	12876.870476444206
2011	12682.502301436838
2012	12462.625552894711
2013	12231.328157044629
2014	11988.329980849674
2015	11737.924525819892
2016	11486.835525349432
2017	11240.201160841463
2018	10998.767063496703
2019	10765.89438905096
2020	10563.588706066626