Year	%
1989	78.85
1994	81.76
1998	24.88
1999	21.79
2000	21.79
2001	21.39
2002	21.46
2003	19.98
2004	18.62
2005	15.79
2006	15.83
2007	14.97
2008	15.85
2009	14.92
2010	14.89
2011	14.58
2012	15.35
2013	14.4
2015	13.13
2016	13.63
2019	13.91
2020	14.53
2021	14.63