Quote Originally Posted by Arthur View Post
Your best bet would be either a JavaScript library designed for charts (HighCharts (examples), jqxChart (examples) etc.) or just use Excel Web App (examples) / Google Spreadsheets. The screenshot below is a graph I created in less than 30 seconds on my Google Drive. When you update the figures, the graph will get updated automatically.

P.S. Please don't use Java or Flash.
+1 this. After thinking about it, I was going to recommend using something like Google Spreadsheets.