Year	% of total
1990	3.211390055680375
1991	3.328271323715515
1992	1.6224512168384126
1993	1.1388888888888888
1994	0.9506172839506173
1995	1.026801253045597
1996	1.4472601379153778
1997	1.5058069683620345
1998	1.388595006347863
1999	1.071535468422628
2000	1.1482132396016402
2001	1.4232849416453175
2002	1.4346833998859099
2003	1.5184075100378895
2004	1.8096906012842966
2005	0.8691122443384328
2006	0.32345604561278474
2007	1.1025991792065664
2008	1.1267682115609134
2009	0.4586547893634507
2010	0.8737941907383161
2011	1.3175888912265936
2012	1.3187360039810898
2013	0.767328625691488
2014	0.7026251270705017
2015	0.5798643436627211