Year	% of total
1992	50.63952380952381
1993	48.136589716684156
1994	47.17711458172259
1995	49.59660524943508
1996	45.5490560875513
1997	38.762767146486034
1998	38.56020618556701
1999	36.04304838122954
2000	31.514470654840537
2001	30.532346347120214
2002	28.942171141587792
2003	27.821748810656516
2004	29.496435359512287
2005	29.268477337110482
2006	31.488437340588334
2007	29.061054925893636
2008	30.597881201260996
2009	40.7793479020979
2010	27.56066373840898
2011	34.43272150814053
2012	31.579499916373976
2013	30.55731353245453
2014	30.275718849840256
2015	30.557219894334125
2016	30.49302119181308