Year	% of total exports
1995	42.17902593567094
1996	44.013344865933526
1997	45.20199844947885
1998	45.02959446175726
1999	48.188328449162576
2000	48.45979192788641
2001	50.32193086579619
2002	48.443766192284485
2003	48.80865074039977
2004	45.54998865585625
2005	46.43243671303751
2006	45.747053945785595
2007	42.84479305037215
2008	44.94163843880127
2009	50.725999423710554
2010	33.91874821726906
2011	30.956762053820068
2012	31.09017943020132
2013	31.920334926718997
2014	33.21024503615965
2015	36.01121081513931
2016	37.02724147051045
2017	37.82764830396916
2018	37.70752604517323