Year	% of total
1990	79.0137533734938
1995	72.3245808291218
2000	78.7770880697869
2005	80.4757532050242
2010	79.9012011357137
2011	84.1965416686938
2012	76.4061511327294
2013	64.4148745550407
2014	58.9439325876
2015	62.9901708094748
2016	47.5135572587257
2017	48.223500003969