Year	% of total
1991	95.17638588912887
1992	98.2051282051282
1993	82.86203941730935
1994	76.88787185354691
1995	96.8403074295474
1996	95.63269876819709
1997	95.01557632398755
1998	97.35034347399412
1999	96.6914805624483
2000	99.2181947405828
2001	100
2002	99.58012596221134
2003	99.85925404644617
2004	99.12980420594634
2005	99.75903614457832
2006	94.14694894146949
2007	97.84263959390863
2008	88.74045801526718
2009	94.56375838926175
2010	95.55555555555556
2011	98.18181818181819
2012	97.8088861838101
2013	95.56724267468068
2014	99.13217623497998
2015	97.78645833333334