Year	cubic meters
1961	1306.6276072120618
1962	1301.4368513557392
1963	1291.7434984935041
1964	1279.5751128185382
1965	1268.007422492782
1966	1259.4713557904772
1967	1252.4800409477473
1968	1247.5625746198366
1969	1244.0348528804384
1970	1242.8086688804542
1971	1240.5457491562738
1972	1235.6974456589176
1973	1231.815326246289
1974	1227.945711292158
1975	1224.4023386084666
1976	1222.2165977625084
1977	1220.7083404287005
1978	1219.5699511785822
1979	1218.4742630819967
1980	1217.1321081275821
1981	1217.164206203034
1982	1217.4950384540737
1983	1217.5917658327517
1984	1217.610050640402
1985	1217.2474221742718
1986	1216.8135647942574
1987	1215.7766472405822
1988	1211.9175120464602
1989	1207.5232319922816
1990	1203.927331347589
1991	1199.4619213820679
1992	1194.605400930478
1993	1189.9479149881377
1994	1186.2861759205061
1995	1183.8042555987283
1996	1181.4934411853058
1997	1178.6377795642873
1998	1176.1237470361682
1999	1173.4312861618519
2000	1170.58895256676
2001	1166.5696145556778
2002	1161.351949159883
2003	1156.5002106276008
2004	1151.5058289704857
2005	1145.1892935871213
2006	1137.6609576943708
2007	1129.3373613032554
2008	1120.4510039381053
2009	1111.4720307788834
2010	1101.3634328617113
2011	1087.1274685946994
2012	1080.4063624410412
2013	1075.325955940132
2014	1070.5628493101606
2015	1064.3774509508262
2016	1059.002127005772
2017	1054.9304018458467
2018	1050.1394322631188
2019	1044.479144362685
2020	1039.9871596252026