Year	%
1996	22.25
1999	21.05
2000	21.34
2001	18.96
2002	19.13
2003	18.92
2006	13.64
2007	15.57
2010	18.71
2011	19
2012	15.51
2013	15.51
2015	14.86
2016	15.57
2017	15.61
2018	15.72
2019	15.58
2020	15.65
2021	16.85