Year	Percent
1981	0.1889
1982	0.22865
1983	0.60284
1984	0.91497
1985	0.96696
1986	1.78622
1987	2.21622
1988	5.15202
1989	12.0856
1990	5.74822
1991	6.83671
1992	6.89974
1993	13.41895
1994	9.36584
1995	10.43299
1996	7.38626
1997	6.66334
1998	7.37072
1999	6.04309
2000	5.32895
2001	5.00694
2002	7.21773
2003	4.61975
2004	8.9018
2005	104.32086
2006	95.00939
2007	12.71205
2008	7.4646
2009	7.99699
2010	3.21618
2011	2.71133
2012	2.78847
2013	3.27781
2014	2.75896
2015	3.26304
2016	4.0286