Year	%
1989	35.43
1991	34.74
1993	35.23
1995	15.6
1999	35.01
2000	10.13
2001	9.67
2003	9.4
2004	7.32
2005	5.87
2006	5.79
2007	5.13
2008	5.51
2009	5.81
2010	6.31
2011	6.45
2013	7.02
2014	3.03
2015	2.86
2021	2.23