Year	%
1995	24.05
1998	23.77
2000	23.81
2001	23.73
2002	23
2003	23.01
2004	23.01
2005	22.81
2007	21.38
2008	21.32
2009	21.3
2010	21.17
2011	21.45
2012	20.85
2013	20.83
2015	17.74
2016	20.55
2019	20.19