Year	cubic meters
1961	7479.367993404558
1962	7311.60162849309
1963	7144.26821314816
1964	6974.329711437108
1965	6798.569210207125
1966	6618.8471673089125
1967	6444.7146016726965
1968	6280.136926015705
1969	6120.092914137878
1970	5961.18455962878
1971	5803.307445599488
1972	5646.913876007461
1973	5492.356470578446
1974	5337.387591382545
1975	5181.194618622862
1976	5024.197983850248
1977	4867.902818958269
1978	4712.299816505902
1979	4558.868986048825
1980	4410.555930527062
1981	4284.253744664968
1982	4161.156549329407
1983	4027.429233949398
1984	3897.812352816982
1985	3758.5421412300684
1986	3615.695405053756
1987	3479.7784013845303
1988	3323.120611655594
1989	3196.311650071675
1990	3091.2950769954955
1991	2967.2523243476544
1992	2853.5450433165975
1993	2768.889014747481
1994	2768.058699620545
1995	2768.5347634633113
1996	2711.6220738362367
1997	2664.6910270567073
1998	2626.4527566810393
1999	2592.3780158488566
2000	2561.8731174114214
2001	2535.058709655117
2002	2512.3500084220827
2003	2493.3958067504914
2004	2477.096242695381
2005	2462.9484851933885
2006	2449.5817617503376
2007	2435.4063807647176
2008	2422.30724765339
2009	2411.209934184929
2010	2400.1745581496834
2011	2388.3383949823183
2012	2375.2883636062634
2013	2360.6859938890425
2014	2344.863727001017
2015	2328.173724090249
2016	2310.6735613431315
2017	2292.8807788846525
2018	2275.02266405154
2019	2257.1568544467273
2020	2236.0469400459915