Year	Percent
1975	65.81925
1976	67.64098
1977	73.67533
1993	88.87309
1994	90.53977
1995	93.62481
1996	94.96872
1997	94.7226
1999	95.22268
2000	96.1636
2001	96.91233
2002	98.37719
2003	97.99002
2004	99.77712
2005	100.1706
2006	99.47516
2007	99.18059
2008	97.30686
2009	94.46467
2010	94.12801
2011	94.11388
2012	101.25329
2013	105.44909
2014	107.38567
2015	102.76136
2016	102.14368