s&p 500 monthly monthly returns for 1980
s&p 500 monthly monthly returns for 1981
s&p 500 monthly monthly returns for 1982
s&p 500 monthly monthly returns for 1983
s&p 500 monthly monthly returns for 1984
s&p 500 monthly monthly returns for 1985
s&p 500 monthly monthly returns for 1986
s&p 500 monthly monthly returns for 1987
s&p 500 monthly monthly returns for 1988
s&p 500 monthly monthly returns for 1989
s&p 500 monthly monthly returns for 1992
s&p 500 monthly monthly returns for 1993
s&p 500 monthly monthly returns for 1994
s&p 500 monthly monthly returns for 1995
s&p 500 monthly monthly returns for 1996
