Year	% of fertilizer production
1961	20.34211742949607
1962	20.96153846153846
1963	19.833333333333332
1964	20
1965	23.83808492086559
1966	17.5100453383184
1967	9.405555555555555
1968	10.727027027027027
1969	10.933333333333334
1970	8.8
1971	9.773784355179703
1972	9.15573053368329
1973	15.179791976225854
1974	9.653128430296377
1975	15.766160764474424
1976	16.046983633458566
1977	14.182367992556408
1978	17.328800786369595
1979	17.676756191299205
1980	19.439908357503228
1981	28.146091413925674
1982	15.365087848219654
1983	34.48428312480658
1984	9.115225415041616
1985	4.520663158028876
1986	2.261239691407289
1987	3.122043519394513
1988	0.8626661296818365
1989	1.477170993733214
1990	3.062985332182916
1991	3.3665835411471323
1992	5.949699714013346
1993	2.997669141914191
1994	2.6397856517935256
1995	2.7364994298745726
1996	3.90464272627336
1997	3.85058018018018
1998	3.3413585375986705
1999	3.014173913043478
2000	4.114373410824555
2001	0.7516442230571151
2002	1.942676218674639
2003	4.628192736183408
2004	3.775074865220143
2005	2.661473729578738
2006	2.8237751235485677
2007	2.814105052977012
2008	2.452830188679245
2009	2.245670065415408
2010	1.04729911396073
2011	1.0454019140659452
2012	1.3537752018342932
2013	11.83882104103017
2014	12.37223217736055
2015	12.497509752224373
2016	11.820084447675153
2017	11.773949058912212
2018	14.768393509097507
2019	13.601227416861853
2020	11.942315784390052
2021	11.733133191836918