Year	cubic meters
1961	7434.268370463578
1962	7248.1774152891685
1963	7094.880148332168
1964	6978.477959410132
1965	6898.351089188166
1966	6826.628311379414
1967	6742.56502861835
1968	6658.191206770787
1969	6583.678636956894
1970	6536.289267688064
1971	6502.077204441563
1972	6452.688694825518
1973	6405.228695995321
1974	6370.82791589561
1975	6373.615000839298
1976	6410.150632193172
1977	6431.918619035231
1978	6431.341135208122
1979	6418.439350117129
1980	6393.003901631292
1981	6358.1255112861445
1982	6321.083834313127
1983	6294.03781688494
1984	6271.475729466544
1985	6243.851776522653
1986	6211.4436932629205
1987	6172.550910558209
1988	6127.352471097551
1989	6078.01036029964
1990	6015.916267975715
1991	5941.19569210371
1992	5876.052526091709
1993	5822.781343750923
1994	5776.549069568096
1995	5738.076412145576
1996	5712.790853878405
1997	5699.045804811067
1998	5682.137034861176
1999	5655.10230905946
2000	5623.412325573302
2001	5587.941333255139
2002	5545.829762519058
2003	5504.8364211968355
2004	5467.124515790721
2005	5432.213970067694
2006	5398.23039593882
2007	5350.201831066847
2008	5282.651263292439
2009	5217.056002384349
2010	5162.999339672832
2011	5105.911001949093
2012	5051.982271543797
2013	4994.2232660093905
2014	4933.6587757028055
2015	4877.815549993022
2016	4824.838075329098
2017	4780.024231409965
2018	4744.942320175788
2019	4711.216426752246
2020	4676.918147102273