Year	cubic meters
1961	4041.089551778388
1962	3928.0415906926396
1963	3826.8872563680598
1964	3735.8378339473725
1965	3653.386454183267
1966	3578.2433439601045
1967	3509.3000917188933
1968	3445.5851796000316
1969	3386.2420836897854
1970	3330.508474576271
1971	3278.0048377679536
1972	3228.672394792343
1973	3181.0124430661213
1974	3133.10752788591
1975	3084.080717488789
1976	3034.725600574513
1977	2985.7420236406515
1978	2946.9769115981912
1979	2896.1309122759735
1980	2847.7111172530304
1981	2805.8201133751227
1982	2771.729766926846
1983	2746.35591215255
1984	2717.7859380510777
1985	2695.6634212878034
1986	2675.1332218289317
1987	2655.1952451639927
1988	2636.9796374560383
1989	2616.859768278066
1990	2598.28575476376
1991	2570.389043471436
1992	2536.790844315182
1993	2506.8937299407494
1994	2472.0401564996414
1995	2450.8733964864578
1996	2425.9344830140494
1997	2395.748786885474
1998	2370.6913266822985
1999	2340.7446988641727
2000	2317.8554066020542
2001	2299.61539329609
2002	2283.7058294683557
2003	2267.239176838062
2004	2253.06571728325
2005	2239.7647392151785
2006	2229.3427207219474
2007	2219.2105708961544
2008	2211.1997144972233
2009	2205.335934951007
2010	2200.0959692898273
2011	2196.5755459101056
2012	2190.4924188737477
2013	2185.1942169800154
2014	2181.242110738276
2015	2178.3559628436296
2016	2176.8597670261533
2017	2174.8978367237546
2018	2173.7120696725683
2019	2173.0115285726133
2020	2172.9617523976826