Year	cubic meters
1961	35999.41120268879
1962	35564.93667551161
1963	35151.44860568463
1964	34761.2857302283
1965	34397.50457669618
1966	34059.46738676704
1967	33750.0599411314
1968	33473.508187031955
1969	33237.71781610169
1970	33043.456445893135
1971	32864.11082262933
1972	32682.44924117875
1973	32501.123615309367
1974	32310.20035127706
1975	32103.656508981538
1976	31891.041937757822
1977	31691.178062830342
1978	31512.317830093238
1979	31352.770010429387
1980	31214.55776555227
1981	31084.840712105823
1982	30948.09246296467
1983	30802.27910138861
1984	30648.997508522385
1985	30487.220167329207
1986	30316.9302957216
1987	30142.66766531962
1988	29956.85173632772
1989	29762.202583759456
1990	29579.610216450885
1991	29406.380227685757
1992	29235.20451325604
1993	29069.15337194297
1994	28903.31964971183
1995	28737.960913879626
1996	28574.678310176583
1997	28412.33884395062
1998	28258.95129867045
1999	28118.646047546128
2000	28005.38480978208
2001	27931.44617334643
2002	27884.96755272512
2003	27853.285086529464
2004	27823.034636056902
2005	27790.62985563642
2006	27752.00901067399
2007	27698.908656990476
2008	27636.84585054641
2009	27570.48415205511
2010	27500.625624319382
2011	27427.113635410366
2012	27349.85537503267
2013	27268.586706416103
2014	27184.312587751963
2015	27095.189927877425
2016	27008.295237576334
2017	26941.73338787914
2018	26903.667944542263
2019	26892.940719733266
2020	26887.631281338527