This plugin can be used to display graphical bars in a wiki page, the syntax is very flexible :

Usage:
{GAUGE(params)}description{GAUGE}
Description is optional and will be displayed below the gauge if present.

Parameters:

{GAUGE(perc=>true,value=>35,bgcolor=>#EEEEEE,height=>20)}happy users over total{GAUGE}

Examples:
{GAUGE(perc=>true,label=>happy users,labelsize=>90,value=>35,bgcolor=>#EEEEEE)}{GAUGE}
{GAUGE(perc=>true,label=>happy users,labelsize=>90,value=>50,bgcolor=>#EEEEEE)}{GAUGE}
{GAUGE(perc=>true,label=>happy users,labelsize=>90,value=>100,bgcolor=>#EEEEEE)}{GAUGE}

Produces: