Year	%
1989	44.42
1990	34.91
1991	28.74
1992	23.88
1993	16.64
1994	15.29
1995	13.84
1996	15.43
1997	15
1998	17.73
1999	16.47
2000	17.21
2001	15.35
2002	15.15
2003	14.79
2004	13.61
2005	12.74
2006	12.56
2007	12.6
2008	13.63
2009	13.87
2010	13.9
2011	14.01
2012	14.31
2013	15.34
2014	14.31
2015	14.21
2016	14.13
2017	13.96
2018	14.01
2019	13.99
2020	14.11
2021	13.73