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