Year	%
1997	20.21
1999	20.66
2000	8.11
2001	7.94
2002	7.44
2003	6.5
2004	6.47
2005	6.49
2006	5.28
2007	5.16
2008	4.99
2009	5.02
2010	5.15
2012	5.11
2013	5.12
2018	5.94
2019	6.57
2020	4.39
2021	4.28