Year	% of fertilizer production
1961	88.6011812820643
1962	89.7893534925747
1963	87.57319787313301
1964	85.21222621351679
1965	82.85029766829099
1966	83.4847720202949
1967	83.98217813043959
1968	83.55965066071403
1969	83.68636368116086
1970	84.97340869333574
1971	85.74436649285343
1972	85.45223153533256
1973	86.41193285232508
1974	79.71204093340468
1975	88.64960080049256
1976	88.81047687143607
1977	86.31369706618376
1978	85.47263061729265
1979	83.46288377595687
1980	81.24279229187613
1981	88.11421176471109
1982	87.13608039418978
1983	83.8010271630544
1984	81.20991386556824
1985	86.07747633395007
1986	82.29897858512685
1987	78.71049818856193
1988	77.60276525135852
1989	80.82879386603696
1990	78.13575464616089
1991	76.39325192824991
1992	76.59275806112926
1993	80.1119819495615
1994	77.43773805768464
1995	77.6440872094414
1996	78.12719921268352
1997	80.1619763930521
1998	81.17949027400375
1999	86.77029434032647
2000	89.18258758500846
2001	90.15416893804411
2002	90.54699120105133
2003	94.94410866940062
2004	88.97831876854157
2005	90.87712271638921
2006	90.68883586446506
2007	86.69727757231706
2008	83.45557433909637
2009	95.24957258408166
2010	86.37120130132448
2011	88.46424050583299
2012	91.78693962980527
2013	90.9331275975005
2014	90.04990129346058
2015	87.64033910741416
2016	88.70175492695805
2017	86.35081867146458
2018	82.70553845330429
2019	83.96790464756401
2020	85.22216848794424
2021	85.20521063863482