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
s&p 500 monthly monthly returns for 1997
s&p 500 monthly monthly returns for 1998
s&p 500 monthly monthly returns for 199
s&p 500 monthly monthly returns for 1999
s&p 500 monthly monthly returns for 1999'
s&p 500 monthly monthly returns for 2000
s&p 500 monthly monthly returns for 2003
