Year	%
1990	80.85
1992	56.02
1996	37
1997	28.9
1999	32.4
2000	33.4
2001	31.79
2002	28.79
2003	25.63
2004	28.57
2005	16.5
2006	13.86
2007	14.66
2008	9.98
2009	10.28
2010	8.88
2011	10.56
2012	10.71
2013	10.59
2015	9.75
2016	8.91
2017	8.88
2018	9.03
2019	10.21
2020	9.42
2021	9.86