Year	%
1988	15.8225
1990	7.081725
1991	6.804993
1993	1.417704
1996	23.67353
1997	1.520946
1999	3.35495
2000	2.993881
2001	2.978631
2002	4.143528
2003	3.573655
2004	1.48582
2005	3.279503
2006	3.631074
2007	2.539564
2008	3.036514
2009	2.99771
2010	2.419683
2011	3.073667
2012	2.962623
2013	2.427324
2014	0
2015	2.991293
2016	2.577678
2017	0.6305609
2018	0.6087937
2019	0.5486659
2020	0.4189628
2021	0.1584188