Year	% of total
1990	1.806182702327197
1991	1.022530329289428
1992	0.9727947238252268
1993	1.698841698841699
1994	0.6061626536453949
1995	0.6196999347684279
1996	1.0088842041861166
1997	1.0396554284865587
1998	0.8229284903518729
1999	0.4954101704793822
2000	6.327998825429453
2001	2.624960704181075
2002	3.513380397307503
2003	0.3265063817156426
2004	0.35998200089995497
2005	0.20167098818784213
2006	3.5398230088495577
2007	7.37149892274546
2008	2.883853588971637
2009	3.676039835969537
2010	0.8402203856749311
2011	1.006065986092617
2012	1.405301820504631
2013	1.8706924844108959
2014	2.7726088574618535
2015	2.461919943322706