Actually, it's quite simply, my birthday is 12/15 and I'm a Sagittarian :)
You can place datapoints in the chart, sure.. you're talking like sharpcharts puts the high and low price labels in the charts? I don't remember where the option is, but you can have the value printed in the charts.
I have no idea how to calculate average percent yield, sorry.
I'm not at all familiar with AIM either.