Year	% of total
1992	78.87379461490295
1993	81.46760447761193
1994	37.250221518987345
1995	40.91370919881305
1996	47.697255369928406
1997	73.5991519434629
1998	74.02159851301116
1999	73.79314638783269
2000	69.65985663082436
2001	68.78289970930233
2002	71.85405906593407
2003	72.82178331090175
2004	71.29100192678227
2005	73.06887245841035
2006	72.07057509771077
2007	67.22509793541556
2008	70.26650289017341
2009	74.46200582807188
2010	76.22573896353167
2011	77.92761162594776
2012	78.54994535519126
2013	78.25730434782609
2014	74.71347870702925
2015	68.85208567057623
2016	72.35512981199642