Year	%
1996	38.48
1997	20.07
1998	20.55
1999	23.5
2000	22.93
2001	19.17
2002	18.44
2003	18.25
2007	17.1
2010	16.77
2011	16.53
2012	16.28
2015	18.52
2016	16.08
2021	18.6