You can have the wiki generate a chart based on tabular data.
Example
The following code inserted in your wiki page:
{chart:title=Pitfalls}
|| ||Quicksand||Alligators||
|# affected|3|4|
{chart}
Will produce the following output:
Want to do more pie chart formatting? See the following links:
More on Pie Charts
Pie Charts with Data Labels
Example 2
Here's a more complex one - the following code:
{chart:type=bar|stacked=true|bgColor=#F9F9F7|3D=true|opacity=50}
|| ||Trout||Herring||Pike||
||John|15|26|41|
||David|21|8|29|
{chart}
Will produce the following output:
Many other formatting options are documented in the notation guide