Year	cubic meters
1961	18434.00878808251
1962	17934.99054467956
1963	17447.19747990824
1964	16965.522117059332
1965	16492.785032172364
1966	16032.014896456792
1967	15580.265632948967
1968	15136.384077821274
1969	14702.412134959479
1970	14279.352700068637
1971	13870.007011982867
1972	13480.63577675357
1973	13097.427133151625
1974	12714.369238105668
1975	12342.903710812152
1976	11986.464702761252
1977	11639.645565444793
1978	11279.508972036288
1979	10907.982176114678
1980	10554.474103544217
1981	10246.260576204013
1982	9957.63292030855
1983	9662.604105116989
1984	9371.760239363837
1985	9086.117336390958
1986	8806.584222364369
1987	8536.07654302724
1988	8286.85076800185
1989	8052.182010058729
1990	7824.363674200551
1991	7621.578563575465
1992	7435.308158853437
1993	6340.797556297849
1994	6177.995064690256
1995	6020.101936814374
1996	5861.059057747441
1997	5713.451624676725
1998	5572.172849983255
1999	5432.631626460651
2000	5297.44763678395
2001	5164.895583655975
2002	5034.284452894154
2003	4906.168816628055
2004	4780.146756092254
2005	4656.992610920904
2006	4536.061125821298
2007	4416.684441373697
2008	4299.555592389576
2009	4185.676104884232
2010	4074.3023665612327
2011	3965.8237808080107
2012	3593.716152294052
2013	3496.501070267075
2014	3402.086979468162
2015	3309.337128515397
2016	3221.444096209006
2017	3138.09961052965
2018	3055.936675196939
2019	2975.844719993489
2020	2898.2174110625456