Year	Percent
1971	4.1811
1972	3.2081
1973	4.86208
1974	2.80874
1975	-2.39534
1976	3.078
1977	2.40572
1978	2.84575
1979	2.32608
1980	0.35474
1981	-0.63433
1982	0.72667
1983	-0.50151
1984	0.00026
1985	0.56939
1986	1.72563
1987	2.02436
1988	4.3732
1989	3.89003
1990	2.20065
1991	0.3843
1992	0.55538
1993	-1.81805
1994	1.24477
1995	1.23875
1996	0.20956
1997	1.30815
1998	2.61018
1999	2.40072
2000	2.99686
2001	1.30985
2002	0.19361
2003	0.15441
2004	1.29857
2005	0.45109
2006	3.17172
2007	12.28825
2008	7.72348