Year	%
1990	71.1
1992	42.71
1996	27.23
1997	20.53
1999	31.44
2000	29.24
2001	28.31
2002	24.88
2003	22.29
2004	25.42
2005	12.78
2006	9.08
2007	10.98
2008	5.67
2009	7.33
2010	5.36
2011	5.92
2012	7.32
2013	7.29
2015	7.06
2016	7.44
2017	7.33
2018	7.41
2019	8.53
2020	8.46
2021	8.55