For quick company financials Business Insights: Essentials or Nexis Uni Academic. For in-depth statistics use Mergent or Bloomberg. Bloomberg is only available at the library.
Mergent provides (1) quarterly and annual (2) balance sheets, income statements, retained earnings, and cash flow statements for up to fifteen years by clicking on the "company financials" tab. Ratios (3) can also be found in the company financials. All data can be exported to (4) Excel.