Year	cubic meters
1961	36.03880615400095
1962	35.106169129867624
1963	34.19278493941859
1964	33.30375072169228
1965	32.44807521100415
1966	31.632424145763224
1967	30.856184446421846
1968	30.11628288332931
1969	29.415264257174126
1970	28.750514706089525
1971	28.124672962787205
1972	27.52487918780027
1973	26.939092006050736
1974	26.364095434439957
1975	25.789424602863495
1976	25.22128525147513
1977	24.644286828348303
1978	24.05196995735778
1979	23.456306460209262
1980	22.85789729837026
1981	22.27192672856822
1982	21.69731734585309
1983	21.11768962339029
1984	20.543818290091576
1985	19.98567307040275
1986	19.446054631784776
1987	18.924584376858572
1988	18.41673332603294
1989	17.93212379126054
1990	17.4780471358462
1991	17.061634403570984
1992	16.669683323692144
1993	16.29136785582791
1994	15.929693469528177
1995	15.584356971041833
1996	15.251994598658632
1997	14.926770458273348
1998	14.610055215635576
1999	14.30453762677736
2000	14.011220269258944
2001	13.726033127973118
2002	13.441987788249818
2003	13.164247872150721
2004	12.899492942861555
2005	12.646172364041318
2006	12.40238239843968
2007	12.162675049020141
2008	11.926800502304358
2009	11.695760885501963
2010	11.46100108429093
2011	11.210755545058301
2012	10.960060050607419
2013	10.7091732314791
2014	10.461090997222747
2015	10.232921869932625
2016	10.021643743993902
2017	9.824207015061472
2018	9.639412240694387
2019	9.46802294075448
2020	9.305343628939225