Year	%
1989	84.97
1994	78.42
1998	23.26
1999	20.15
2000	20.15
2001	19.86
2002	19.94
2003	19.29
2004	18.3
2005	15.27
2006	15.27
2007	14.76
2008	15.6
2009	15.19
2010	15.16
2011	15.09
2012	15.87
2013	15.51
2015	15.56
2016	15.57
2019	15.81
2020	15.82
2021	15.89