Year	cubic meters
1961	13632.001963258848
1962	13395.564611828919
1963	13109.72353869532
1964	12834.164741177168
1965	12566.777471500425
1966	12297.128594803886
1967	12039.371944222257
1968	11785.939689766874
1969	11534.071987395133
1970	11288.158804251227
1971	11045.422679396257
1972	10819.641590764315
1973	10600.860082621986
1974	10392.536802729894
1975	10196.991711481962
1976	10012.138923729062
1977	9834.336522363228
1978	9659.564886852362
1979	9486.511395832998
1980	9317.012251048982
1981	9150.650705099768
1982	8984.161390228506
1983	8821.820176297257
1984	8666.035840865618
1985	8512.557954906251
1986	8360.064182883385
1987	8209.105125894797
1988	8061.9222594857
1989	7918.812433495447
1990	7777.551471229254
1991	7644.132718912064
1992	7992.369452643652
1993	7793.9066212372845
1994	7673.504632941833
1995	7560.006220934301
1996	7449.725658499815
1997	7343.147458624164
1998	7240.217476988439
1999	7141.375672708848
2000	7046.158167562559
2001	6953.527487921145
2002	6863.484280575469
2003	6776.186396049912
2004	6690.571829457606
2005	6607.283614825416
2006	6519.456335066963
2007	6439.955753216015
2008	6361.050599937371
2009	6283.699592098129
2010	6208.139024881972
2011	6134.461295359191
2012	6024.801784961981
2013	5951.2014221980235
2014	5879.499481507696
2015	5810.2235058054075
2016	5742.725487667685
2017	5677.215885138057
2018	5614.700001949037
2019	5555.345194183213
2020	5499.282170840486