Year	%
1996	40.61
1997	25.02
1998	20.95
1999	26.33
2000	22.15
2001	19.22
2002	18.17
2003	16.66
2007	18.68
2010	16.97
2011	11.92
2012	17.47
2015	13.29
2016	9.56
2021	18.44