Year	% of total exports
1998	36.27277170325337
1999	56.18208246522093
2000	60.85802774340443
2001	56.03867981589148
2002	46.711707295354294
2003	46.87489350515709
2004	51.0973272537231
2005	45.78467707549753
2006	41.57664712532231
2007	37.00796751913873
2008	43.9764386642794
2009	42.31923502678153
2010	45.65196569767644
2011	54.18690307164605
2012	45.541620653735
2013	62.96694600020226
2014	64.41015857874032
2015	69.45692504583515
2016	71.55891252932791
2017	71.5107883514984
2018	73.19355970951806