Year	% of fertilizer production
1972	83.47449523915972
1973	84.63746078618307
1974	78.2110447240119
1975	86.18794827728966
1976	85.78486835509759
1977	82.6311864709648
1978	81.60324212196409
1979	79.82106743133106
1980	77.89656576614274
1981	84.80809309481067
1982	83.32736719831186
1983	80.35316334567877
1984	77.50984543975666
1985	82.00597324584412
1986	77.90947266480191
1987	74.50091608523931
1988	73.78501773319192
1989	76.68937487750388
1990	74.77481639564147
1991	72.50419009832507
1992	72.08226646214193
1993	74.77286420808365
1994	72.16951649548874
1995	72.46399782652719
1996	72.91553189678794
1997	74.80965523036892
1998	74.80905062748461
1999	78.70114832024252
2000	79.35339392342058
2001	80.18712906077288
2002	80.8742600079937
2003	85.0884515862152
2004	79.34033039530252
2005	78.60597568328599
2006	77.71184433442404
2007	74.40396312998247
2008	71.25902209790686
2009	78.77273664721706
2010	73.32377297879368
2011	75.19424459178067
2012	76.14099907045814
2013	73.46438650713269
2014	74.01076980296303
2015	71.41804342325958
2016	70.06454257719277
2017	69.0757015207266
2018	67.47056519685508
2019	67.81567975203109
2020	67.58090580816709
2021	68.18550034782666