Year	Percent
1992	72.41966
1993	71.60031
1994	69.91952
1995	77.65698
1996	74.59047
1997	80.05061
1998	81.50804
1999	84.81806
2000	99.05706
2001	103.10653
2002	96.62743
2003	100.805
2004	116.60908
2005	113.45865
2006	121.00532
2007	127.18459
2008	122.53476
2009	105.73456
2010	125.13806
2011	138.21745
2012	143.91867
2013	146.38472
2014	158.5375
2015	160.24913
2016	156.57602
2017	158.57602