Year	%
1988	4.32
1989	4.57
1990	5.99
1991	5.39
1992	4.78
1993	4.47
1994	4.96
1995	5.3
1996	3.33
1997	3.1
1998	2.87
1999	2.85
2000	2.14
2001	2.82
2002	2.3
2003	2.22
2004	2.03
2005	2.39
2006	2.44
2007	2.36
2008	1.84
2009	1.86
2010	2.48
2011	1.73
2012	1.67
2013	1.62
2014	2.27
2015	2.26
2016	2.12
2017	2.08
2018	1.98
2019	2.01
2020	1.8
2021	1.43