Year	%
1990	84.11
1992	55.73
1996	38.73
1997	30.08
1999	32.95
2000	36.56
2001	34.91
2002	30.59
2003	26.92
2004	29.51
2005	19.02
2006	16.8
2007	17.2
2008	12.81
2009	13.06
2010	12.51
2011	13.36
2012	14.04
2013	13.93
2015	13.16
2016	13.72
2017	13.75
2018	13.8
2019	15.53
2020	14.62
2021	14.85