Year	%
1996	42.7
1997	24.93
1998	21.95
1999	24.9
2000	21.6
2001	19.8
2002	15.78
2003	15.46
2007	16.72
2010	14.24
2011	14.25
2012	14.36
2015	15.34
2016	12.01
2021	16.72