Year	% of total
1992	49.99322413365307
1993	50.70822618594461
1994	49.9292533163584
1995	50.435716482615575
1996	51.4894124728546
1997	52.239375371151645
1998	50.54617449106812
1999	50.49212340159847
2000	50.6850740321574
2001	50.826444992991014
2002	47.51737075504937
2003	48.61518517430489
2004	46.93715646206959
2005	46.38894851818201
2006	45.93012114946379
2007	47.649329352216625
2008	48.17098012888112
2009	47.54567468442702
2010	50.738878354303935
2011	50.914257720527516
2012	49.62768639439683
2013	51.44001576383422
2014	52.219658881035656
2015	50.09390584499564
2016	50.11330114006486