Year	% of total
1989	98
1998	99.7
2000	99.7
2001	99.9
2011	99.9
2012	99.9
2013	99.9
2014	99.9
2015	99.9
2016	99.9
2017	99.9
2018	99.9
2019	99.9
2020	98.6