Year	% of fertilizer production
1961	90.871312870942
1962	89.37428192130935
1963	85.98899622183104
1964	83.62795732293662
1965	79.41172485244905
1966	81.03809799969893
1967	80.11294845668411
1968	80.93263861395504
1969	77.79772951038237
1970	79.09975187562132
1971	77.16875155774186
1972	77.69742330504148
1973	75.36327418183008
1974	73.1842657647757
1975	78.30490109377685
1976	78.48876876393129
1977	75.97067668184523
1978	72.85263933734838
1979	70.67868189180231
1980	70.0024456361281
1981	79.71707178859447
1982	75.56799023128306
1983	70.02748193263791
1984	67.74490451764792
1985	73.9411494705755
1986	62.70004001123123
1987	58.72341170966013
1988	56.88104000823497
1989	60.915917767786816
1990	59.96934981973938
1991	58.0028113234204
1992	58.456056962492134
1993	60.83449488636969
1994	56.63064504656997
1995	58.880351559844584
1996	58.34558788610678
1997	61.54917596948711
1998	61.34414927964883
1999	67.16401006938752
2000	68.94045660633341
2001	70.87606821677711
2002	74.90394688114894
2003	82.348426287057
2004	74.22858657914024
2005	79.5524993814193
2006	79.52857502739762
2007	73.04805174965345
2008	75.30465918651808
2009	88.63854008676473
2010	77.60322761007346
2011	82.04182283476503
2012	85.16794672448685
2013	81.80258200134327
2014	77.1523397683917
2015	75.69622867858999
2016	74.09394460071498
2017	69.95274181541551
2018	67.26007397945992
2019	68.11474023007985
2020	69.73830248066375
2021	71.0172252564379