Year	%
1988	4.208404
1989	4.33863
1990	11.52495
1991	6.321393
1992	6.29284
1993	5.085296
1994	5.157619
1995	7.162161
1996	9.906788
1997	8.83796
1998	6.800004
1999	6.025379
2000	5.60611
2001	6.488461
2002	8.094247
2003	8.349668
2004	5.721504
2005	4.780674
2006	6.039214
2007	5.870751
2008	4.742306
2009	4.646175
2010	5.3808
2011	4.865139
2012	4.976868
2013	4.921036
2014	5.722713
2015	5.766603
2016	5.496077
2017	5.435838
2018	5.339829
2019	5.697177
2020	1.813626
2021	5.495336