Year	% of fertilizer production
1961	53.3908632240633
1962	59.97685478183824
1963	60.76104564931306
1964	45.59101977435194
1965	49.45452922460899
1966	53.02287668299756
1967	51.31250400775708
1968	37.31710975318802
1969	42.3554722082076
1970	38.19240088414693
1971	37.451159122868404
1972	37.48788421213416
1973	38.8861475914539
1974	37.31750246284993
1975	36.518305105607
1976	37.37208665455659
1977	36.80627877018834
1978	34.99412595732025
1979	32.36583945855469
1980	33.56361590397599
1981	32.7832939322301
1982	35.60033585222502
1983	37.489609310058185
1984	38.10045662100456
1985	38.68061874431301
1986	41.593352883675465
1987	38.530499075785585
1988	38.74883286647993
1989	36.8348623853211
1990	33.92226148409894
1991	29.159802306425043
1992	33.199195171026155
1993	34.11264612114772
1994	45.83333333333333
1995	36.8295589988081
1996	40.88541666666667
1997	32.146596858638745
1998	29.48473282442748
1999	27.636363636363637
2002	28.126113989637307
2003	30.150744680851066
2004	28.623560315215197
2005	26.489979202117603
2006	24.835445329471398
2007	24.303163900414937
2008	18.387810559006212
2009	23.921235989094214
2010	25.174640037157452
2011	24.60491741741742
2012	25.47330308004248
2013	23.620158529994594
2014	23.283933258342707
2015	22.648730782981765
2016	21.684690922591425
2017	19.318005654073506
2018	20.477474035943285
2019	20.58504831572293
2020	20.23313736114874
2021	20.771812516933082