Year	%
1996	22.39
1997	27.24
1998	27.24
1999	21.58
2000	21.26
2001	25.29
2002	24.36
2003	24.21
2006	19.23
2007	19.24
2010	18.44
2011	14.64
2012	14.45
2013	18.53
2015	24.83
2016	18.67
2017	18.26
2020	19.32