Year	kg per hectare
1961	2502.1
1962	2594.1
1963	2746.3
1964	2847.9
1965	2539
1966	2744.8
1967	2542.1
1968	2469.3
1969	2903.4
1970	2890.4
1971	2971.7
1972	2829.6
1973	3091.5
1974	3183.4
1975	3246.7
1976	3393.4
1977	3546.7
1978	3539.8
1979	3673.5
1980	3570.7
1981	3837.4
1982	3355.8
1983	3442.8
1984	3686.7
1985	3713.3
1986	3992.3
1987	3821.2
1988	3871.2
1989	3964.4
1990	3923.4
1991	5607.9
1992	5593.8
1993	6126.8
1994	4733.8
1995	2511.2
1996	1858.7
1997	1994.5
1998	3115.7
1999	2856.6
2000	2375.4
2001	3015.7
2002	3190.8
2003	3250.3
2004	3429.6
2005	3367.8
2006	3543.7
2007	2921.5
2008	3554.9
2009	3364.4
2010	3424
2011	3586.3
2012	3922.4
2013	3979.6
2014	4151.8
2015	3654
2016	4079.7
2017	4015.9
2018	3504.3
2019	4372.2
2020	3499.7
2021	3461.4
2022	3516.5