Year	%
1997	16.95
1999	16.89
2000	5.2
2001	5.2
2002	5.23
2003	4.39
2004	4.39
2005	4.39
2006	3.48
2007	3.3
2008	3.21
2009	3.25
2010	3.16
2012	2.73
2013	2.74
2018	2.17
2019	2.2
2020	2.2
2021	2.2