Year	cubic meters
1961	3388.9138197269476
1962	3338.7316380990997
1963	3260.5096629445407
1964	3184.0795956509737
1965	3110.8426369379918
1966	3041.1235173891564
1967	2973.1922823835525
1968	2905.7280319694214
1969	2839.2893140030865
1970	2775.1002692333664
1971	2715.7773970736835
1972	2657.0785080893465
1973	2596.0555688708478
1974	2536.344327431555
1975	2478.5494044815114
1976	2422.836711268125
1977	2368.1369631921466
1978	2314.261669662849
1979	2261.435039406918
1980	2209.0555922257568
1981	2158.436934421205
1982	2108.7420330297155
1983	2059.0185314994515
1984	2010.548267193773
1985	1963.5556496842441
1986	1918.2877230868623
1987	1874.749400855578
1988	1832.4213994262302
1989	1791.1428763336096
1990	1751.6496513123889
1991	1713.856250022841
1992	1676.6152634839195
1993	1639.7741642239198
1994	1593.0410093371354
1995	1559.599900679228
1996	1527.7580774498047
1997	1497.110137693311
1998	1467.4065519564317
1999	1438.6666960181205
2000	1410.985720397059
2001	1384.0617150942112
2002	1357.787112190845
2003	1332.909813065237
2004	1307.7627996330662
2005	1286.0743630116365
2006	1265.8464822132453
2007	1247.0818488894067
2008	1229.0995433934695
2009	1211.2966940826539
2010	1193.6916099333641
2011	1176.4391644445202
2012	1160.0469327817575
2013	1144.654632901158
2014	1130.0716957282398
2015	1116.3782382603185
2016	1103.0049353909035
2017	1089.7496575845526
2018	1076.9591324272199
2019	1064.7730888766707
2020	1052.9331772923952