Year	cubic meters
1961	20722.85934976531
1962	19794.977747609406
1963	19318.465850708853
1964	18848.58399552042
1965	18384.98862071994
1966	17929.86466335049
1967	17479.179846673942
1968	17034.6570029114
1969	16604.040149415712
1970	16202.866454130757
1971	15864.022056292963
1972	15524.039305648686
1973	15145.100487077456
1974	14773.13759953499
1975	14425.364315963654
1976	14103.261657638886
1977	13776.829730128618
1978	13428.562061949844
1979	13076.07471562429
1980	12764.029089273048
1981	12502.456741609365
1982	12220.722356886306
1983	11901.067129057486
1984	11580.048557455139
1985	11272.826947839489
1986	10985.982304786045
1987	10713.301696299452
1988	10453.672520537095
1989	10199.163589273352
1990	9958.211798418215
1991	9732.873162374433
1992	9484.278228041252
1993	8484.764291142385
1994	8261.38522403532
1995	8053.676525560652
1996	7854.324710550952
1997	7664.979375749913
1998	7479.604563197034
1999	7296.9934035507395
2000	7125.0510083339195
2001	6957.649421668435
2002	6781.9055134305845
2003	6609.317678889163
2004	6449.1569099923345
2005	6294.7313443285575
2006	6146.337126556141
2007	6007.502180518488
2008	5873.407001688418
2009	5739.7642678530065
2010	5606.718823745779
2011	5473.82563669224
2012	5099.967477360329
2013	4977.576239074103
2014	4858.274710723836
2015	4743.228120572753
2016	4629.66237101846
2017	4518.304269905318
2018	4411.390891780304
2019	4307.38204373735
2020	4204.829892080207