Year	% of fertilizer production
1977	0.03438576704330543
1978	0.03225806451612903
1979	0.2149137088896125
1980	0.2022058823529412
1981	0.273224043715847
1982	0.21052631578947367
1983	0.2204585537918871
1984	0.17550017550017552
1985	0.2785515320334262
1986	0.11836040306515637
1987	0.08204512481865026
1988	0.2015431705471312
1989	0.13451708366962603
1992	0.6759154429780834
1993	0.34153005464480873
1994	0.308546744831842
1995	0.255885363357216
1996	0.561324726354196
1997	0.3443328550932568
1998	0.27676068227043393
1999	0.3325875309911108
2000	0.21867992420950164
2001	0.3095251481785066
2002	0.39169604386995693
2003	0.2852904256533151
2004	0.29698265621287717
2005	0.2670654844567888
2006	0.7659552042160738
2007	0.7843157596906535
2008	1.3624084787128266
2009	0.2961734391659756
2010	0.5145212885785087
2011	1.0665516448125145
2012	1.1642434782608695
2013	1.2544549908144518
2014	1.9501637698769088
2015	1.9754611288604902
2016	1.6491642142436729
2017	1.9227547243327487
2018	3.4810895696006208