Year	% of total imports
1998	7.233265986825027
1999	7.367304822563914
2000	5.9882635078565745
2001	6.157524262863013
2002	6.024081343288392
2003	5.0055229594552975
2004	4.933647585541677
2005	4.43403624554107
2006	4.170309296723966
2007	4.044702580410414
2008	4.005611896642499
2009	4.265875737852265
2010	3.806300405783783
2011	3.662287591464
2012	3.5602028469496423
2013	3.481737491856529
2014	3.547398502185835
2015	3.851571871013552
2016	4.072832705775094
2017	3.9599037186722743
2018	3.8850739538714762