Year	kg per hectare
1961	1204.8
1962	1210.7
1963	1357
1964	1273.7
1965	1082.6
1966	1178.6
1967	1151.9
1968	1209
1969	1399.5
1970	1525.6
1971	1617.4
1972	1374
1973	1278.1
1974	1804.7
1975	2070.1
1976	2275.4
1977	2412.5
1978	2420.1
1979	2321.8
1980	2546.8
1981	2504.4
1982	2692.8
1983	2702.5
1984	2727.8
1985	2615.6
1986	2681.5
1987	2430.4
1988	2549.1
1989	2516
1990	2342.1
1991	2175.9
1992	1751.1
1993	1324.4
1994	1789.1
1995	1964.6
1996	2007.3
1997	2188.6
1998	1874.7
1999	2750.8
2000	2528.4
2001	2880.6
2002	3123.2
2003	3188.8
2004	2921.5
2005	2561.6
2006	2782.8
2007	2912.9
2008	2674.2
2009	2068.8
2010	1937.2
2011	2619.1
2012	2803.2
2013	2903.8
2014	2813.7
2015	2964.6
2016	2939.3
2017	2854.3
2018	2876.5
2019	2831.7
2020	2572.3
2021	2406.1
2022	2354.2