Year	%
1988	76.41355
1989	76.80885
1990	67.02573
1992	66.52413
1993	66.73917
1994	64.18568
1995	65.99099
1996	49.01272
1997	49.44036
1998	32.41945
1999	27.60398
2000	9.75727
2001	8.648255
2002	7.429176
2003	7.650723
2004	6.883996
2005	6.883996
2006	7.023858
2007	14.55693
2008	9.971525
2009	6.505945
2010	6.337801
2011	5.641749
2012	6.078093
2013	5.141011
2015	5.04492
2016	5.835344
2017	12.26567
2018	5.462543
2019	4.375216
2020	4.650285
2021	4.401905