Year	% of fertilizer production
1961	73.79789890718918
1962	49.06512446244255
1963	37.98336711373411
1964	32.05112723605828
1965	27.249287833244928
1966	27.4268885197865
1967	24.24456481445257
1968	18.845913380303394
1969	15.538056466344328
1970	17.96479471797588
1971	16.149467499081897
1972	19.056876560262094
1973	18.39424252794143
1974	17.270728914471025
1975	21.002505460619297
1976	17.827584365655703
1977	19.26236796244265
1978	20.581388681841638
1979	19.080238964767474
1980	19.74837000814996
1981	22.8219563687544
1982	26.068721576553816
1983	22.904590318032273
1984	23.5946250740677
1985	23.300357819406443
1986	21.662890256862706
1987	20.11830031613178
1988	18.44294889550585
1989	20.618310501705057
1990	20.15869152395809
1991	20.932701221659585
1992	21.303159539220946
1993	21.23980982236343
1994	18.356223501663006
1995	20.764806156165143
1996	21.937790867966285
1997	20.879177271567936
1998	19.932279909706548
1999	21.2673884332814
2000	18.463067658455117
2001	20.692618498207253
2002	22.815453747268517
2003	21.078041894592836
2004	18.089435235777884
2005	24.382697950919052
2006	16.85736368031348
2007	21.456126929287514
2008	27.59797168509836
2009	26.10166814103374
2010	21.548172806122697
2011	26.398306264414696
2012	28.984204275358454
2013	26.70968346900622
2014	26.890986639644165
2015	25.671804454748866
2016	25.254759449241565
2017	24.268089041172196
2018	23.92349789632487
2019	24.82322852414623
2020	28.810841684883716
2021	27.88238409125859