Year	Percent
1997	43.92011
1998	59.78742
1999	60.00915
2000	176.95928
2001	101.67415
2002	71.04497
2003	67.73108
2004	59.08947
2005	62.32144
2006	65.85924
2007	66.41025
2008	63.65448
2009	80.66879
2010	85.39262
2011	69.85848
2012	87.56696
2013	83.39748
2014	77.97506
2015	88.78363
2016	83.17655