Year	%
1988	5.69714
1989	5.884611
1990	4.59707
1991	3.460966
1992	1.305056
1993	0.9467269
1994	1.129841
1995	0.9777074
1996	3.505829
1997	1.672417
1998	0.9790074
1999	8.254114
2000	1.625701
2001	0.6583247
2002	0.6194206
2003	0.4792833
2004	0.5169191
2005	0.3579383
2006	0.4026769
2007	0.4366128
2008	0.3829769
2009	0.38145
2010	0.3519751
2011	1.753371
2012	0.3534194
2013	1.885786
2014	0.0929911
2015	0.6575924
2016	0.5353811
2017	0.3552292