Year	cubic meters
1961	3687.9776868508598
1962	3656.769230104639
1963	3625.1491901629824
1964	3593.3846308793777
1965	3562.9776445221037
1966	3534.0804995431986
1967	3506.256056258974
1968	3480.5197632055824
1969	3455.87366261247
1970	3435.817329767072
1971	3416.587454258036
1972	3393.5649030898358
1973	3371.942000224535
1974	3351.9045302177074
1975	3332.860301052908
1976	3315.869829265878
1977	3300.325972226712
1978	3285.4386566099993
1979	3271.001457118549
1980	3255.6694219794017
1981	3241.606879956235
1982	3230.9151227111165
1983	3222.920748496976
1984	3216.139495836579
1985	3209.0542100844314
1986	3200.8764046994606
1987	3192.1690340138757
1988	3182.299386218557
1989	3171.621400029046
1990	3160.5213124842626
1991	3147.94680424389
1992	3274.8154423985948
1993	3204.306944769885
1994	3196.329576742054
1995	3190.290418242382
1996	3185.098205866327
1997	3180.31179140942
1998	3176.056063771288
1999	3170.8240251401617
2000	3167.030150791866
2001	3162.8481710154592
2002	3155.5961156954722
2003	3144.382618041318
2004	3132.610102776063
2005	3121.531848572047
2006	3111.428522133092
2007	3101.003176233959
2008	3091.0765406070054
2009	3083.7696018046036
2010	3079.453368986741
2011	3084.9229326076925
2012	3080.3789842058154
2013	3072.886449244448
2014	3065.230593864731
2015	3058.551712527178
2016	3052.061573751761
2017	3047.2752941875474
2018	3041.9175702252187
2019	3039.428298173971
2020	3037.2209985333343