Year	%
1992	16.36
1995	13.1
1997	13.4
1998	13.69
1999	13.02
2000	13.37
2001	14.46
2002	13.7
2003	12.75
2004	13.27
2005	13.6
2006	14.18
2007	15.55
2008	14.99
2009	13.61
2010	12
2011	12.51
2012	12.51
2013	12.51
2014	13.93
2015	14.48
2016	13.9
2017	14.52
2018	16.49
2019	16.15
2020	18.87
2021	18.92