Year	annual %
1961	7.012158832365166
1962	7.0624751405857555
1963	6.888712970827618
1964	6.460461105954307
1965	5.4290503329655415
1966	2.3568927371594284
1967	2.0657466156479836
1968	1.730361140452822
1969	1.1412341958077827
1970	0.47719902114819557
1971	1.1221562028371719
1972	0.5380226130731749
1973	0.32074823192420954
1974	0.23054127837957233
1975	-1.1400079025355132
1976	-7.288893158248308
1977	-7.3803659875785925
1978	-7.694312657069041
1979	-8.150469558279045
1980	-9.521106281996545
1981	-13.510659895105222
1982	-13.898264779540462
1983	-14.076372617408792
1984	-14.760466107558907
1985	-11.467027138165875
1986	3.431800538908482
1987	3.282523170708356
1988	3.1827626106387674
1989	3.0424450518219976
1990	-28.41099547590844
1991	-23.039705920275146
1992	18.352054583149283
1993	1.313143984026901
1994	-1.418202239217149
1995	-2.6026742732513273
1996	-9.947240753023618
1997	-9.497376028601657
1998	-9.633977000658431
1999	-9.7923616046248
2000	-9.911333054219664
2001	-235.72324723018534