Year	% of fertilizer production
1961	31.560926309920017
1962	24.98346411713418
1963	22.187931559872144
1964	14.082368570886317
1965	11.413483241769942
1966	11.849371139391234
1967	12.360996841742084
1968	11.92697505197505
1969	11.040553742542976
1970	9.259064804568547
1971	10.060343827191193
1972	9.315094956459715
1973	9.860732456978138
1974	8.90408029524368
1975	9.273441579431584
1976	10.029104675065637
1977	9.998371090617482
1978	10.659932110783785
1979	8.613651578778473
1980	8.657238798307265
1981	7.648100148620066
1982	7.62314743186612
1983	7.472655029242377
1984	7.237090086694309
1985	6.845547792478074
1986	6.526887712454722
1987	6.594885598923284
1988	6.810085911853042
1989	6.417043253712072
1990	6.568501920614597
1991	6.192933703850734
1992	6.608554632069734
1993	6.098319850653391
1994	6.864686468646865
1995	6.431663574520717
1996	6.618464961067853
1997	6.593406593406594
1998	6.034912718204489
1999	4.325848157869156
2000	4.398278120905858
2001	4.260693435005361
2002	4.1748422608994575
2003	4.486037400848604
2004	4.0560993657207565
2005	4.1480131049135265
2006	5.107523795464168
2007	4.136628470411711
2008	3.1731254730140592
2009	4.821936059025177
2010	2.279009900620727
2011	2.9455352012914617
2012	3.6524272554128205
2013	3.5694405310807706
2014	3.073141748980549
2015	3.8086199411459853
2016	3.498597900975626
2017	3.368511455978925
2018	3.3958394425331107
2019	3.483083007733189
2020	3.524133018758918
2021	3.78927442253892