Year	%
1989	17.06409
1993	15.0743
1995	14.79871
1996	13.39591
1997	12.16562
1998	11.39582
1999	10.86859
2000	10.59767
2001	11.22468
2002	11.5399
2003	7.986491
2004	8.124207
2005	8.074893
2006	8.019535
2007	8.239651
2008	8.418102
2009	8.697151
2010	8.158904
2011	7.961274
2012	9.278472
2013	8.667514
2014	8.631402
2015	8.654757
2016	8.349237
2017	5.197579
2018	5.181158
2019	4.969921
2020	5.164937
2021	5.774917