Year	% of total
1991	48.33875199373547
1992	48.62996479108715
1993	49.76117801414031
1994	49.3216174335272
1995	49.107485572474936
1996	49.38081858484719
1997	49.50429037316516
1998	49.89942626174969
1999	49.240684597907666
2000	47.825783076318125
2001	48.75642871360706
2002	48.14690002354643
2003	47.08889462143383
2004	46.67831586562215
2005	46.35014657968744
2006	46.11252313463052
2007	44.80999298148365
2008	45.61868485161875
2009	46.729904324308336
2010	44.551619951940694
2011	44.471525010276274
2012	42.87778693596671
2013	43.22285150473401
2014	45.056668987886404
2015	42.070055738001116
2016	42.38929379990612