Year	cubic meters
1961	17348.81744795355
1962	17277.551524126866
1963	17177.010849560935
1964	17093.718930421586
1965	17029.854377367672
1966	16962.06037108834
1967	16882.289100587433
1968	16806.434463480302
1969	16708.43776106934
1970	16569.447966861106
1971	16376.731672264836
1972	16135.140029965261
1973	15878.416695020984
1974	15617.529880478087
1975	15362.668715022497
1976	15132.564352001977
1977	14929.011029187739
1978	14718.692739779519
1979	14523.897739903668
1980	14357.71214252227
1981	14190.558934260063
1982	14057.031384474152
1983	13957.728023699652
1984	13871.498402088311
1985	13849.31157615906
1986	13843.020151482193
1987	13841.585036625118
1988	13900.910339412003
1989	13956.10207777878
1990	13944.326281298609
1991	13864.386493823982
1992	13770.11772045537
1993	13701.460827383684
1994	13647.557672072027
1995	13577.76637984328
1996	13470.753345007986
1997	13336.341721710829
1998	13197.956417654448
1999	13050.011372152767
2000	12877.203512901118
2001	12673.802448526903
2002	12462.019452449385
2003	12260.663712263742
2004	12038.537076974406
2005	11779.08966387286
2006	11465.767313718135
2007	11139.042069661295
2008	10914.248752211806
2009	10803.9577763691
2010	10745.248790885398
2011	10698.493739416132
2012	10653.255450064169
2013	10597.307505315955
2014	10520.123493368028
2015	10421.192707632163
2016	10304.216211896743
2017	10192.645153667647
2018	10067.14994465122
2019	9930.406092810792
2020	9828.735290495293