Year	%
1996	22.74
1999	23.76
2001	19.73
2002	19.82
2003	19.14
2006	16.05
2007	15.46
2008	15.75
2009	18.65
2010	18.94
2011	16.14
2012	16.24
2013	16.9
2014	16.9
2015	16.79
2016	17.01
2017	16.95
2018	16.65
2019	16.31
2020	24.15
2021	24.36