Year	%
1989	50.17
1991	48.45
1993	56.58
1995	38.5
1999	43.7
2000	30.51
2001	20.83
2003	20.27
2004	12.79
2005	16.22
2006	16.21
2007	14.7
2008	14.59
2009	14.54
2010	14.27
2011	14.26
2013	18.24
2014	18.76
2015	18.52
2021	19.05