Year	%
1996	23.62
1999	22.42
2000	15.39
2001	15.38
2002	15.64
2003	15.56
2004	15.86
2006	15.85
2007	16.36
2010	13.91
2011	13.98
2012	15.98
2013	15.36
2015	17.86
2016	18.94
2020	15.86
2021	16.05