Year	Percent
1971	70.47125
1972	62.89597
1999	95.58649
2000	96.26636
2001	96.00046
2002	101.0986
2003	96.65847
2004	93.55096
2005	93.80168
2006	92.32196
2007	92.58641
2008	88.65584
2009	96.55942
2010	97.60386
2011	98.82749
2012	97.40186
2013	97.14193
2014	102.20815
2015	100.26044