Year	% of total
1995	100
1998	98
1999	99.3
2000	100
2001	100
2002	100
2004	100
2005	100
2007	100
2008	99.2
2009	98.9
2010	98.3
2011	98.8
2012	99.2
2013	99
2014	99.9
2015	98.7
2016	98.6