Year	%
1997	19.42
1999	19.54
2000	4.72
2001	4.59
2002	3.99
2003	3.52
2004	3.19
2005	4.29
2006	3.85
2007	2.54
2008	4.99
2009	4.72
2010	4.73
2012	4.07
2013	4.16
2018	11.82
2019	24.56
2020	7.89
2021	7.73