Year	%
1988	5.84881
1989	5.87766
1990	5.892178
1991	5.705175
1992	5.904278
1993	5.829779
1994	5.730656
1995	5.301154
1996	5.044769
1997	3.594695
1998	3.616213
1999	2.784232
2000	2.719702
2001	2.750161
2002	2.832351
2003	2.848871
2004	2.051925
2005	2.746271
2006	3.570032
2007	3.68798
2008	3.586889
2009	3.710618
2010	3.617394
2011	3.623009
2012	3.430491
2013	2.65952
2014	3.77442
2015	3.14688
2016	3.381339
2017	3.6656
2018	3.518366
2019	3.198897
2020	3.113169
2021	2.947575