Jeremy is exactly right.
I have done this very thing in the past.
You would use one 3D object per stat you want to display.
Set the Y Scale of the layer for each item - and note the range - for example, set the scale to 0 for 0% and find the maximum (let's say Y Scale 4.0) for 100%.
Then, again as Jeremy mentioned, you connect a Widget device to each layer to control the Y Scale.
You can automate this using the Widget Designer:
Have the Widget receive data from something external that is generating the data and have the Widget automatically update the bars;
If you are using the Widget Designer Free, you can use a button to add to the bar graph. This script would do the trick:
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DeviceFadeParam(<siteID>,<playerID>,"Y Scale",1)
If you want to make this a little more dynamic, that is completely possible too.
If you need some pointers, this forum is a great place to look for help with that if you're not familiar with Widget Designer or with programming.
Let us know how it goes!