Year	%
1996	21.17
1999	18.5
2000	18.58
2001	12
2002	12.07
2003	12.07
2006	11.38
2007	12.36
2008	10.35
2009	11.92
2010	10.25
2011	9.76
2012	9.74
2013	10.63
2015	9.82
2016	9.85
2017	9.77
2018	9.87
2019	9.48
2020	9.4
2021	9.28