Year	%
1989	31.92
1990	18.95
1991	16.54
1992	15.71
1993	13.02
1994	13.26
1995	10.97
1996	14.83
1997	14
1998	15.94
1999	12.31
2000	12.69
2001	10.47
2002	10.01
2003	9.53
2004	7.67
2005	7.17
2006	6.7
2007	6.77
2008	6.74
2009	7.59
2010	7.76
2011	7.84
2012	7.76
2013	10.08
2014	7.79
2015	8.27
2016	8.01
2017	8.59
2018	7.95
2019	7.97
2020	8.41
2021	7.76