Year	%
1988	3.051853
1989	3.898643
1990	3.715998
1991	1.78281
1992	1.008281
1993	1.139396
1994	0.9129187
1995	1.074702
1996	1.70954
1997	0.6275411
1998	1.230029
1999	2.147892
2000	1.464638
2001	0.5216866
2002	0.599173
2003	0.5184239
2004	0.5253513
2005	0.5587271
2006	0.4838878
2007	0.4422389
2008	0.3806237
2009	0.3461871
2010	0.3354973
2011	4.340568
2012	0.3168853
2013	4.653303
2014	0.1347232
2015	0.3249054
2016	0.3244356
2017	0.2760388