Year	cubic meters
1961	1458.2100441725893
1962	1445.4423069669886
1963	1432.1210812064448
1964	1420.6367833108156
1965	1408.5676058806775
1966	1396.8611694017798
1967	1390.4891787713732
1968	1384.319162209008
1969	1373.3851461491013
1970	1368.8240147610911
1971	1366.3148631484987
1972	1359.7929210756363
1973	1355.5170926524818
1974	1354.9889610822224
1975	1360.0504179587463
1976	1365.8943831742235
1977	1368.989951792874
1978	1370.181921742892
1979	1369.5763337209535
1980	1366.7383603962855
1981	1364.6582863128842
1982	1365.95687717543
1983	1369.5424660688175
1984	1374.284705681839
1985	1377.359527896763
1986	1376.7292813437125
1987	1374.6160067995959
1988	1369.256148014491
1989	1358.7080225727877
1990	1347.0467052188076
1991	1337.267716597627
1992	1327.1384001195268
1993	1318.4425231081386
1994	1313.8773394568368
1995	1310.0214646404822
1996	1306.2347647399772
1997	1304.324967275157
1998	1304.1274598113928
1999	1303.2848148817293
2000	1301.52095008402
2001	1299.3333023679136
2002	1297.1505905156835
2003	1296.4326438541048
2004	1296.714126403693
2005	1297.4505872006716
2006	1298.914904697703
2007	1300.652956957917
2008	1303.1284081907734
2009	1306.434506173312
2010	1308.4374774156965
2011	1332.9183763265326
2012	1330.418465223539
2013	1326.7926999865647
2014	1321.2731145617881
2015	1309.8841865284387
2016	1299.3531200850375
2017	1294.5061810976401
2018	1290.6216842632277
2019	1287.714355398716
2020	1286.662810446033