Year	%
1989	41.1
1991	42.12
1993	43.6
1995	20.44
1999	43.11
2000	16.15
2001	14.5
2003	13.34
2004	11.21
2005	10.15
2006	10.43
2007	9.95
2008	10.23
2009	10.42
2010	10.31
2011	10.72
2013	11.02
2014	7.75
2015	7.28
2021	7.75