Year	Percent
1990	4.68225
1991	1.99153
1992	2.36617
1993	2.37943
1994	2.14747
1995	3.33969
1996	3.66049
1997	3.32785
1998	3.67255
1999	3.23902
2000	3.40605
2001	3.17812
2002	3.77784
2003	4.65325
2004	5.92215
2005	6.93519
2006	6.8297
2007	7.38078
2008	6.5441
2009	5.63359
2010	5.72967
2011	4.90868
2012	4.86161
2013	6.03624
2014	6.34858
2015	6.09598
2016	6.94889