Year	% of fertilizer production
1961	86.82107596239145
1962	88.25326013549315
1963	85.83741868349335
1964	83.8087851770611
1965	81.37419073858005
1966	81.50035886796296
1967	82.00628134896758
1968	81.5255303797647
1969	81.37924617366102
1970	82.73619978029829
1971	82.93358838826852
1972	82.41748141770155
1973	83.08280580191021
1974	76.46898297700493
1975	84.96310175468263
1976	84.77314693479312
1977	82.08091578627865
1978	81.00276111256903
1979	79.39309965315647
1980	77.784767307569
1981	85.53468175789408
1982	84.6190290308577
1983	80.84881990080045
1984	78.46851984811596
1985	83.50548918847953
1986	79.17847138270187
1987	75.65720068985942
1988	74.70309411619327
1989	78.19271033875758
1990	76.48725728655319
1991	74.88649418387801
1992	71.84549562045751
1993	74.14142168290701
1994	71.27145969312456
1995	71.76090577259423
1996	71.77324160879887
1997	73.34804446137424
1998	73.95107394134367
1999	77.62997040963792
2000	78.89003667326602
2001	79.92056942819025
2002	80.22576369265674
2003	83.40147381744498
2004	77.90618189719208
2005	77.62820834745862
2006	78.07223568766999
2007	75.03100753999509
2008	73.35222798060508
2009	85.21298809913557
2010	77.22166767549984
2011	79.2400286463722
2012	81.88494030971071
2013	82.78262380661374
2014	79.97857846783948
2015	77.47529192431439
2016	77.34793327223919
2017	75.19643011575721
2018	73.3954195229454
2019	73.46086658905237
2020	75.78075860725461
2021	75.94415314378803