Year	%
1988	8.15
1989	5.57
1990	6.19
1992	6.26
1995	5.85
1996	31.35
1997	25.94
1998	26.49
1999	5.54
2000	17.34
2001	18.64
2002	18.94
2003	18.62
2004	17.6
2005	13.47
2006	11.42
2007	11.51
2008	13.13
2009	12.61
2010	11.03
2011	10.43
2012	10.62
2013	11.26
2014	9.66
2015	9.38
2016	16.27
2017	9.98
2018	9.54
2020	12.99
2021	12.67