Year	cubic meters
1961	31729.85954442908
1962	31357.88262370541
1963	31022.313296903463
1964	30707.68537299978
1965	30391.74682838422
1966	30041.20330177629
1967	29634.060138111035
1968	29168.171904895706
1969	28661.959794370163
1970	28098.939200598074
1971	27516.21942291672
1972	26968.516113069836
1973	26433.213696769817
1974	25894.119184216466
1975	25337.93600427723
1976	24750.789073321375
1977	24142.01707660107
1978	23527.126344985376
1979	22943.262784554343
1980	22425.676370743753
1981	21982.454371281638
1982	21598.91410963926
1983	21237.213833414517
1984	20861.8429237203
1985	20448.938625043385
1986	20006.240478681426
1987	19532.29997312069
1988	19037.139888047644
1989	18561.880028949723
1990	18114.888277672988
1991	17711.481589808587
1992	17350.05730294155
1993	17007.068075080748
1994	16683.758590605055
1995	16381.49342110207
1996	16099.016335332171
1997	15836.57813680479
1998	15594.820802632521
1999	15372.898567076612
2000	15169.016240588948
2001	14905.16758057679
2002	14548.7550136478
2003	14177.755232111966
2004	13823.978896237722
2005	13483.424047501238
2006	13154.321918841455
2007	12835.232123406637
2008	12528.44762189375
2009	12238.390370969191
2010	11968.946622890337
2011	11717.658188385545
2012	11478.27552073461
2013	11251.20640802655
2014	11038.142351529392
2015	10839.084345975618
2016	10653.27026076078
2017	10478.955565382916
2018	10314.936785525022
2019	10158.481633185616
2020	9970.682534382848