Year	%
1997	31.52
1999	33.25
2000	18.21
2001	17.47
2002	15.24
2003	13.85
2004	13.75
2005	13.81
2006	11.57
2007	11.64
2008	11.06
2009	11.09
2010	11.94
2012	12.11
2013	12.15
2018	16.98
2019	19.36
2020	10.83
2021	10.41