Year	%
1988	3.14
1989	3.49
1990	6.01
1991	4.71
1992	3.88
1993	3.54
1994	4.21
1995	5.73
1996	4.22
1997	3.47
1998	3.9
1999	4.31
2000	3.3
2001	4.26
2002	2.57
2003	2.54
2004	2.64
2005	2.68
2006	2.75
2007	2.53
2008	2.37
2009	2.44
2010	2.78
2011	2.3
2012	2.28
2013	2.21
2014	2.76
2015	2.73
2016	2.48
2017	2.48
2018	2.46
2019	2.55
2020	1.71
2021	2.24