Year	%
1988	26.06424
1989	25.49622
1990	14.68104
1991	13.51651
1992	14.40344
1993	14.08887
1994	14.54027
1995	8.469366
1996	4.157885
1997	4.070841
1998	6.359293
1999	20.64743
2000	4.211875
2001	4.699732
2002	3.754065
2003	3.298512
2004	4.955564
2005	3.719069
2006	3.594573
2007	3.340821
2008	3.148012
2009	3.740263
2010	3.37444
2011	3.211788
2012	3.399374
2013	3.183203
2014	3.04756
2015	3.011401
2016	2.134678
2017	2.990922
2018	3.064476
2019	3.085244
2020	26.65311
2021	2.283862