as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
where can i find historical p/e ratios for companies?
user
the mathematics site, wolframalpha, provides such data. here is a link to historic p/e data for apple. you can chart other companies simply by typing "p/e code" into the search box.  for example, "p/e xom" will give you historic p/e data for exxon. a drop-down list box allows you to select a reporting period : 2 years, 5 years, 10 years, all data.  below the chart you can read the minimum, maximum, and average p/e for the reporting period in addition to the dates on which the minimum and maximum were applicable.
assistant