Year	% of total
1990	23.83031156486534
1991	21.421516874978717
1992	6.798576665947811
1993	1.9018228792880725
1994	3.3931317273193233
1995	1.6863905325443789
1996	4.033002893910473
1997	3.37086460939672
1998	1.6207077479158165
1999	7.63236305294522
2000	14.53106735005845
2001	13.11795014621919
2002	12.194980918237539
2003	13.373698746547694
2004	14.350469283276452
2005	20.929587235518557
2006	20.402417818994785
2007	17.85449146250928
2008	15.202221055001125
2009	14.34815270094926
2010	63.79655586704045
2011	62.835609985869056
2012	63.56811658202693
2013	52.65780730897009
2014	47.16828478964401
2015	46.477219351808365