Year	%
1991	55.15823
1993	4.590322
1994	27.25984
1995	8.312798
1996	16.19342
1997	19.54281
1998	12.04043
1999	13.94126
2000	13.61122
2001	14.38958
2002	12.67881
2003	7.00203
2004	12.43039
2005	13.38596
2006	7.350167
2007	15.5176
2008	16.13403
2009	14.10581
2010	8.956992
2011	12.03828
2012	5.018817
2013	13.01075
2014	10.77487
2015	8.208835
2016	6.048726
2017	5.587792