Year	%
1990	56.36
1992	27.01
1996	23.72
1997	20.13
1999	28.51
2000	23.36
2001	26.51
2002	23.08
2003	21.45
2004	22.96
2005	13.9
2006	8.99
2007	11.99
2008	5.98
2009	6.84
2010	6.1
2011	7.33
2012	6.32
2013	6.34
2015	7.32
2016	6.35
2017	5.78
2018	4.88
2019	6.59
2020	6.19
2021	5.87