Year	% of total
1990	93.8390500470672
1991	98.92737904677118
1992	94.36189475996143
1993	101.47722081396358
1994	101.88431520467933
1995	102.27018095488354
1996	99.63738635431035
1997	97.36192616337286
1998	92.97525456590695
1999	100.08949682819087
2000	99.12896043274644
2001	89.55157189757489
2002	84.0663324839962
2003	86.92370148937678
2004	86.71375458272617
2005	85.25501045037785
2006	85.17290728075797
2007	83.59969618085891
2008	83.14991433974048
2009	84.28291518570681
2010	79.29359506270963
2011	79.37501754056052
2012	75.27504699469479
2013	72.31499478575408
2014	73.52952936378831
2015	70.5930516435836
2016	72.24394749158252