Year	%
1988	4.12
1989	4.07
1990	3.61
1991	4.04
1992	4.24
1993	4.36
1994	4.3
1995	5.22
1996	5.59
1997	4.33
1998	4.17
1999	4.42
2000	4.49
2001	5.75
2002	5.52
2003	5.23
2004	4
2005	3.58
2006	2.82
2007	2.74
2008	2.49
2009	2.91
2010	2.2
2011	2.37
2012	2.27
2013	1.18
2014	2.29
2015	2.3
2016	2.55
2017	2.51
2018	2.45
2019	3.53
2020	2.22
2021	1.84