Year	Percent
1961	-12.03111
1962	-11.70669
1963	-13.55519
1964	-15.99413
1965	-19.94793
1966	-23.34575
1967	-22.26166
1968	-21.21421
1969	-26.98091
1970	-35.46148
1971	-36.86868
1972	-17.04088
1973	10.05794
1974	7.04294
1975	-6.18545
1976	0.99282
1977	-1.2938
1978	-3.48322
1979	-0.11025
1980	-10.13993
1981	-20.50322
1982	-23.66225
1983	-17.25554
1984	-13.70276
1985	-10.32548
1986	-7.77514
1987	-6.50597
1988	-8.67165
1989	-12.09902
1990	-8.32196
1991	-9.89017
1992	2.14776
1993	15.69723
1994	13.76655
1995	17.33799
1996	11.00566
1997	-0.89293
1998	5.22205
1999	10.22993
2000	16.93488
2001	13.07957
2002	2.91251
2003	15.38686
2004	13.24519