Year	cubic meters
1961	20350.74839023227
1962	19152.68116797119
1963	18695.084225728115
1964	18242.242318195913
1965	17794.993611772352
1966	17355.011558681414
1967	16923.497807123047
1968	16497.703816260524
1969	16078.07034445392
1970	15663.902844224163
1971	15258.142252153657
1972	14864.850166892904
1973	14473.125534844043
1974	14079.232922758483
1975	13690.607652987766
1976	13314.43161022133
1977	12944.292684792372
1978	12561.753119906927
1979	12184.031974740365
1980	11854.554481385776
1981	11587.25613815271
1982	11313.328260521304
1983	11012.292281864506
1984	10705.01601323764
1985	10403.17860216778
1986	10120.76832232035
1987	9848.391014640341
1988	9587.177662134225
1989	9327.436921240049
1990	9088.980217064636
1991	8864.590382869865
1992	8610.26380749641
1993	8307.434535569819
1994	8035.902941603293
1995	7789.392448161901
1996	7585.716731462043
1997	7391.237214772938
1998	7190.428320420918
1999	6989.670167491675
2000	6798.479062652889
2001	6611.601740983682
2002	6415.3964803395465
2003	6222.235392369447
2004	6042.418681975517
2005	5867.4959020038
2006	5702.435676340956
2007	5550.6802705173
2008	5395.100360826509
2009	5236.827689723247
2010	5085.403278317732
2011	4936.59179374957
2012	4548.549164182008
2013	4415.113489394559
2014	4288.209727656924
2015	4168.286524629865
2016	4052.4912652889307
2017	3940.234690460197
2018	3832.453933037994
2019	3728.243235637031
2020	3627.063868640249