Year	%
1993	21.89
1997	23.54
1998	23.72
2001	21.63
2002	19.79
2003	19.37
2005	19.36
2006	19.35
2007	19.6
2008	19.6
2009	19.6
2014	20.52
2015	20.54
2016	20.54
2017	20.62
2018	20.72
2019	20.74
2020	20.74
2021	20.74