Year	cubic meters
1961	13952.89422620577
1962	13686.119578497342
1963	13352.159711417415
1964	13031.779506498377
1965	12721.185997362536
1966	12405.465655654862
1967	12104.28691876872
1968	11808.163845154393
1969	11514.957529804964
1970	11230.38566287079
1971	10958.009831971538
1972	10701.385500494864
1973	10452.412667366594
1974	10215.960439099672
1975	9994.930022636912
1976	9785.518085856947
1977	9585.067079606071
1978	9389.129617688546
1979	9196.097415656826
1980	9007.438890413503
1981	8822.839075888025
1982	8637.354500032867
1983	8456.219965233213
1984	8282.717743375384
1985	8112.712007028093
1986	7944.941886159566
1987	7779.876239052696
1988	7620.221478396132
1989	7466.788697299086
1990	7319.272881592537
1991	7180.10272469444
1992	7660.350661720169
1993	7464.885168397517
1994	7336.659553657858
1995	7216.240336438649
1996	7099.565299241353
1997	6987.286097652555
1998	6878.773858688254
1999	6774.964864979314
2000	6675.7237868625525
2001	6579.495145738787
2002	6486.272377492909
2003	6396.000428077293
2004	6307.789924165964
2005	6222.63873817329
2006	6133.653433820815
2007	6054.82615621776
2008	5976.891160517545
2009	5899.391310880083
2010	5822.57669710978
2011	5745.391235645492
2012	5630.163396099185
2013	5554.9625632274765
2014	5481.981163987331
2015	5411.5927214297335
2016	5343.302450859096
2017	5276.517622543132
2018	5212.827950357759
2019	5152.027040446061
2020	5094.927649523833