Year	%
1997	20.53
1999	20.89
2000	7.86
2001	7.74
2002	7.31
2003	6.32
2004	6.72
2005	6.77
2006	5.46
2007	5.19
2008	5.12
2009	4.97
2010	5.12
2012	4.71
2013	4.72
2018	8.28
2019	11.28
2020	4.57
2021	4.34