Year	% of total
1990	99.9
1995	99.9
1996	100
2000	99.8
2001	99.8
2002	99.8
2003	99.8
2004	99.8
2005	99.8
2006	99.8
2007	99.8
2008	99.8
2009	99.8
2010	99.8
2011	99.8
2012	99.8
2014	99.8
2015	99.9
2016	99.8
2017	99.9
2018	99.9
2019	99.9
2020	99.9
2021	99.8