Year	annual %
1961	7.112375533428166
1962	15.405046480743692
1963	27.387802071346375
1964	-5.239385727190606
1965	18.875119161105815
1966	19.406575781876505
1967	21.356615177971793
1968	14.277808522412839
1969	-4.842615012106537
1970	30.432569974554706
1971	17.908700741318768
1972	30.0132362673726
1973	13.133112751336217
1974	19.41507311586052
1975	21.721929163526752
1976	6.887478718464633
1977	15.884737909064581
1978	19.292765213045108
1979	23.138158583848327
1980	25.119088125212656
1981	18.933985994969067
1982	12.587172744941121
1983	2.1171811535337124
1984	7.3136777208770445
1985	5.1751297257227575
1986	5.546011188934409
1987	-3.4641068447412353
1988	-26.88715953307393
1989	-2.063745491100467
1990	36.650163023789396
1991	32.18076175326971
1992	25.565140071167953
1993	18.939701301812953
1994	15.756070417831689
1995	8.366831532786986
1996	7.309075925669513
1997	13.736690592081583
1998	15.523948363904244
1999	8.464688316468102
2000	9.266503599853344
2001	7.889808232853043
2002	-1.70735763421427
2003	3.5214049708729864
2004	8.045417041477771
2005	8.566959701376254
2006	22.27703459448542
2007	16.00060252764456
2008	14.583178193579528