Year	cubic meters
1961	409448.2302831988
1962	398457.094768308
1963	388269.4299850331
1964	378956.4388787292
1965	370651.1926201963
1966	363367.1621627734
1967	357003.18784589315
1968	351369.83205688396
1969	346304.67051481566
1970	341717.4634638807
1971	337580.4029673458
1972	333797.7877932504
1973	330198.05032437504
1974	326690.62397909176
1975	323233.948953178
1976	319818.24768795294
1977	316531.34185647604
1978	313553.4452497954
1979	311175.7277767592
1980	309698.5771856238
1981	309098.7910517824
1982	309117.42485945416
1983	309620.5927243015
1984	310564.20882801316
1985	311905.06696899456
1986	313594.65353646287
1987	315566.4614393497
1988	317753.31267717056
1989	320096.90568563825
1990	322573.7368762013
1991	323882.9398357201
1992	323490.80131758744
1993	322542.2215798145
1994	321527.96492810315
1995	320611.3166482415
1996	319810.60842309485
1997	319116.1145693058
1998	318489.43500502844
1999	317936.0803362471
2000	317501.7225456524
2001	317184.97675073607
2002	316970.5506738584
2003	316870.9454324565
2004	316928.4504434368
2005	317226.7276022793
2006	317788.08940789883
2007	318563.52963103465
2008	319565.0732612876
2009	320795.2527626994
2010	322221.80626046215
2011	323824.6241081386
2012	323939.5348712172
2013	322442.53565598995
2014	320856.3269273014
2015	319192.1921086684
2016	317486.66490138817
2017	315754.1676929769
2018	306805.4802333249
2019	301720.3065278002
2020	302307.3198511795