Year	%
1988	3.59
1989	3.77
1990	4.8
1991	4.5
1992	4.18
1993	3.79
1994	4.16
1995	6.28
1996	4.4
1997	3.66
1998	3.47
1999	3.48
2000	2.41
2001	3.37
2002	2.45
2003	2.52
2004	2.24
2005	2.46
2006	2.3
2007	2.24
2008	1.72
2009	1.85
2010	2.13
2011	1.59
2012	1.46
2013	1.49
2014	2.03
2015	2.02
2016	2.09
2017	1.96
2018	1.83
2019	1.84
2020	1.48
2021	1.39