Year	cubic meters
1961	12982.873550180413
1962	12742.64218269446
1963	12431.766408932624
1964	12135.409414965568
1965	11849.340063376518
1966	11556.499399476532
1967	11279.119801008053
1968	11006.420805897731
1969	10735.369860086797
1970	10471.116528539802
1971	10214.479168056065
1972	9975.087885720153
1973	9747.545728683666
1974	9533.451240792076
1975	9334.820668427445
1976	9146.989439061164
1977	8969.398883847809
1978	8798.503123380618
1979	8631.61948875134
1980	8468.517003747009
1981	8306.092342462789
1982	8141.939568003177
1983	7983.278102092358
1984	7831.836738991459
1985	7683.518201265362
1986	7535.946254713742
1987	7389.7030041832795
1988	7248.050200135591
1989	7112.456584569291
1990	6981.93213350092
1991	6858.9304202634
1992	7548.166742285703
1993	7436.062984285926
1994	7328.1859557897515
1995	7224.193633586705
1996	7123.936750613287
1997	7027.247251687583
1998	6934.295335520783
1999	6846.5831896681975
2000	6763.982749112692
2001	6684.768582919329
2002	6609.267450425148
2003	6536.3450954522505
2004	6465.056146631779
2005	6395.908512873588
2006	6321.039599205021
2007	6258.910106036749
2008	6196.539160686746
2009	6134.360998848503
2010	6073.756458924382
2011	6012.010623429064
2012	5948.278960320139
2013	5884.318092239062
2014	5822.221146282267
2015	5763.297655854043
2016	5707.624246630695
2017	5654.341659821335
2018	5605.484354309205
2019	5560.83131856215
2020	5521.69974740313