Year	% of total
1990	71.1564272992871
1991	72.29233585024092
1992	66.87098972841616
1993	73.61259935593814
1994	76.08058938353186
1995	75.54160566213196
1996	71.4887505341099
1997	70.76848841448758
1998	68.75411652984052
1999	72.82134056285655
2000	70.91724252838392
2001	64.9063618751963
2002	62.346344468624785
2003	64.2713977029902
2004	65.28952422109538
2005	63.758859736160645
2006	64.61710616918874
2007	64.76239499532629
2008	64.49375967163003
2009	65.3535217684024
2010	60.539985516791354
2011	59.87957745186384
2012	56.89067275892966
2013	54.06429301558061
2014	54.97933892215305
2015	52.72027027570247
2016	53.59980883789203