Year	% of total
1992	50.690398924249216
1993	32.31920590433483
1994	35.06693989071038
1995	29.09885077561722
1996	29.087174343734524
1997	28.0483227767925
1998	26.932294998730637
1999	30.16433728726147
2000	28.56795551112222
2001	42.84480371900827
2002	43.6231628638867
2003	49.697781013395456
2004	54.676916984452916
2005	50.60760163710778
2006	59.946918349429325
2007	63.95589240276263
2008	70.16639621365788
2009	74.79863166268895
2010	74.46363561076605
2011	66.66338935574228
2012	64.53013979193759
2013	63.50370181586493
2014	64.97883542752069
2015	68.2333291886851
2016	65.90719534598898