Year	% of total merchandise exports
1964	65.04894299580488
1965	69.26771653543307
1966	73.42913927534016
1967	76.33484398603947
1968	75.22999572100984
1981	71.03999773314604
1982	79.77110842587183
1983	77.12939391505448
1984	75.53989886274984
1985	73.33488437745297
1986	81.37603386042315
1987	78.29735433336596
1988	63.67541320384723
1989	71.42726091277424
1990	74.30354830354831
1991	75.71780719146884
1992	70.53503120595933
1993	66.195796460177
1994	77.72563548420295
1995	73.88453159041394
1996	75.10562279487296
1997	79.2011229108635
1998	78.0782131422473
1999	73.35710889205896
2000	71.79837720150098
2001	68.60002667220382
2002	67.20189889027432
2003	69.19397275652983
2004	66.75759262912104
2005	65.53248719115551
2006	57.2631891588462
2007	54.11877491560866
2008	53.022559650819844
2009	48.74292509946113
2010	48.774647599188405
2011	44.71859164335446
2012	35.64890119474327
2013	26.159121250631088
2014	22.563748159351
2015	22.014088698203864
2016	35.15794112150781
2017	38.349199379391564
2018	34.27274520214458
2019	20.516786494126062
2020	20.94746813784197