Year	%
1996	23.64
1999	22.78
2000	21.01
2001	20.34
2002	20.78
2003	21.45
2004	20.2
2006	17.12
2007	19.23
2010	15.77
2011	13.15
2012	8.69
2013	15.39
2020	15.57
2021	15.62