Year	% of total
1990	29.167881084232
1991	24.92302955665025
1992	5.047516585978125
1993	5.853658536585367
1994	4.426705370101597
1995	21.008094186902134
1996	6.177821065813275
1997	5.472567360044675
1998	4.197627427975492
1999	3.5142522452167126
2000	3.69073275862069
2001	0.36038633415020904
2002	0.41339396444811904
2003	0.41899441340782123
2004	0.6065857885615251
2005	0.9082152194853447
2006	0.32935364347468093
2007	0.28804608737397985
2008	0.14196143381048149
2009	0.45571395185791075
2010	0.316080600553141
2011	0.06866784382970374
2012	0
2013	0
2014	0
2015	0