Year	Percent
1992	27.48615
1993	52.27259
1994	51.24051
1995	37.23341
1996	40.11763
1997	51.8598
1998	64.60733
1999	92.76795
2000	84.82604
2001	74.7429
2002	79.17269
2003	97.53192
2004	80.44463
2005	56.49471
2006	44.32556
2007	42.0994
2008	40.06475
2009	68.04349
2010	89.93842
2011	100.62817
2012	135.62519
2013	159.14292
2014	185.40885
2015	199.8826
2016	231.98693