Year	% of total
1990	54.44714191127786
1991	34.112515378593
1992	51.078409346214336
1993	52.22710163111669
1994	37.9801664196968
1995	38.637343682621825
1996	29.544437483218474
1997	42.815277913451204
1998	47.34590536057273
1999	43.46921476458349
2000	42.69732753262897
2001	43.77104377104377
2002	53.94726485635577
2003	58.62644026682838
2004	45.074476505720654
2005	45.929386535957725
2006	48.56457478913565
2007	62.19210840972499
2008	54.29152648462562
2009	43.99401645474944
2010	37.15869153825358
2011	52.96157950907151
2012	50.325686774284904
2013	33.498243349824335
2014	26.041976778803217
2015	33.173162484427834