Year	% of total
1990	99
1995	99
1997	99
1998	99
1999	99
2000	99
2001	99
2002	99
2003	99
2004	98
2005	98.7
2006	99
2007	98.4
2008	98.5
2009	98.9
2010	99.1
2011	99.1
2012	98.9
2013	98.6
2014	98.9
2015	98
2016	99
2018	99
2019	99