Year	Percent
1995	3.98511
1996	12.59257
1997	17.7688
1998	11.51527
1999	10.72757
2000	12.60497
2001	13.4287
2002	30.17196
2003	17.67474
2004	26.35902
2005	28.44391
2006	57.48974
2007	116.85669
2008	38.4874
2009	42.4524
2010	42.78174
2011	36.16571
2013	36.9879
2014	34.76843
2015	37.25701
2016	39.30929
2017	41.50436