Year	Percent
1981	3.47942
1982	2.88054
1983	3.89647
1984	5.30817
1985	9.18691
1986	17.37942
1987	10.7247
1988	9.8538
1989	7.58545
1990	9.69999
1991	9.30156
1992	13.05335
1993	9.66447
1994	5.91527
1995	4.64867
1996	3.90678
1997	2.78563
1998	3.9806
1999	4.77539
2000	4.21243
2001	3.69976
2002	3.20711
2003	4.26395
2004	2.36107
2005	2.94703
2006	2.91043
2007	2.52922
2008	0.19414
2009	1.10737
2010	1.36744
2011	-0.2797
2012	-0.00658
2013	0.32773
2014	1.08834
2015	0.7874
2016	0.36161
2017	0.19115
2018	0.58129
2019	0.89083
2020	2.30909
2021	1.95942