Year	%
1988	5.36
1989	4.95
1990	3.98
1991	4.29
1992	4.59
1993	4.94
1994	4.93
1995	3.14
1996	4.87
1997	2.62
1998	2.46
1999	2.33
2000	2.18
2001	2.24
2002	2.09
2003	2
2004	1.89
2005	1.84
2006	2.32
2007	2.31
2008	2.23
2009	2.47
2010	2.3
2011	2.21
2012	2.31
2013	1.71
2014	2.28
2015	2.1
2016	1.94
2017	1.86
2018	1.91
2019	2.26
2020	1.8
2021	1.61