Year	cubic meters
1961	16206.771900228943
1962	15718.869480207957
1963	15261.363617022602
1964	14828.003428631275
1965	14425.209044874196
1966	14050.13023791728
1967	13685.402610299767
1968	13301.870371542502
1969	12922.16198818751
1970	12596.705469826675
1971	12295.15876980766
1972	11992.19303775178
1973	11712.19182567382
1974	11446.204540696575
1975	11185.817215430106
1976	10941.515363270511
1977	10702.012217003388
1978	10482.155785877225
1979	10275.678500377411
1980	10067.376572653337
1981	9867.735659135395
1982	9661.391570812972
1983	9458.64217499543
1984	9261.717191227604
1985	9073.240954923194
1986	8899.519789852231
1987	8723.555708334887
1988	8560.510397360435
1989	8333.480485869793
1990	8184.894640019813
1991	8234.38298758108
1992	8284.470867150041
1993	8335.174405003336
1994	8386.499792987514
1995	8438.463835692755
1996	8491.073167482788
1997	8544.345310980816
1998	8598.287374581672
1999	8652.917641594222
2000	8708.243728526813
2001	8790.352702281863
2002	8816.75248524259
2003	8849.80208026277
2004	8886.865576081975
2005	8932.464261011253
2006	8988.998334863245
2007	9057.187214753316
2008	9126.954236976448
2009	9188.667947159352
2010	9234.399614695532
2011	9259.27519495249
2012	9274.579618473444
2013	9291.58727943706
2014	9310.845161683344
2015	9337.998398307634
2016	9352.939969771576
2017	9361.54604018783
2018	9384.672492373646
2019	9424.737167204295
2020	9479.010334940302