Year	cubic meters
1961	5267.942732673457
1962	5142.6566126431235
1963	5020.189624351951
1964	4900.64772083683
1965	4784.6785892157695
1966	4672.681741434147
1967	4563.128812978091
1968	4456.894110357931
1969	4356.720699629934
1970	4261.92465127084
1971	4172.378993304517
1972	4088.441349102018
1973	4009.1916793782593
1974	3934.9317304249817
1975	3864.487359283805
1976	3795.783948003511
1977	3729.063216944185
1978	3662.897951663066
1979	3596.6354292976066
1980	3533.274512342872
1981	3473.931499597537
1982	3419.965330101466
1983	3371.9829852804
1984	3326.491974176594
1985	3281.064566255071
1986	3235.6916398123667
1987	3190.8839346789796
1988	3147.778169395297
1989	3107.6052458495374
1990	3069.036939695865
1991	3031.5912477960674
1992	2995.836978126475
1993	2962.0303057213578
1994	2931.4207441544804
1995	2904.6783585838634
1996	2881.701880736183
1997	2861.924656256018
1998	2844.705276141683
1999	2828.0041612367286
2000	2812.044989950401
2001	2790.6571125419687
2002	2762.849119082826
2003	2735.300608500775
2004	2709.021673250838
2005	2683.763323385449
2006	2657.1778576966512
2007	2629.658211668062
2008	2602.8260479591404
2009	2577.8132205396832
2010	2554.60504572235
2011	2531.1912999119886
2012	2512.234415070704
2013	2498.609202188403
2014	2485.939259181626
2015	2474.6098236292146
2016	2464.353914080114
2017	2455.0359925480357
2018	2436.5482233502535
2019	2421.685089207907
2020	2408.86901774716