Year	cubic meters
1961	13663.449709181932
1962	13486.925808465627
1963	13326.490275634213
1964	13170.039386676168
1965	13022.40443344689
1966	12884.51229287012
1967	12751.620724081822
1968	12625.576394621077
1969	12502.318424959249
1970	12381.986963199552
1971	12237.74619716355
1972	12115.51042031722
1973	12000.335155539104
1974	11889.738691465902
1975	11783.642409192842
1976	11687.325037526425
1977	11593.720278274095
1978	11500.987655047653
1979	11408.347022401485
1980	11317.932469135641
1981	11229.291500735339
1982	11147.532721538013
1983	11072.904023467127
1984	11003.278744333118
1985	10933.961306823636
1986	10862.99252974103
1987	10790.892713731728
1988	10717.49512626942
1989	10640.421307271119
1990	10565.445988394267
1991	10478.614031999137
1992	12740.206069388098
1993	12510.521678746305
1994	12436.013505032059
1995	12365.712242993966
1996	12298.674811914148
1997	12231.899833192303
1998	12168.30061600361
1999	12107.793238155928
2000	12050.53914851758
2001	11994.642622111618
2002	11938.495697126249
2003	11880.89335826131
2004	11821.488660235711
2005	11758.805771526158
2006	11685.920485472967
2007	11605.07792591058
2008	11520.546612917802
2009	11444.348517221662
2010	11380.35975255838
2011	11336.504129499686
2012	11278.531286752448
2013	11218.377092757044
2014	11157.939965623875
2015	11099.551237889411
2016	11040.485840293059
2017	10988.808590196977
2018	10940.586890619896
2019	10899.210307122821
2020	10860.782789262228