Trying to develop a chart that is very similar to - google finance chart 
<http://www.google.com/finance?q=INDEXDJX%3A.DJI%2CINDEXSP%3A.INX%2CINDEXNASDAQ%3A.IXIC&ei=aXskVPjFL8f1qAHT3IGoCg>
.

The chart in the above link allows selecting multiple indexes using the 
checkbox. Whenever we select, multiple checkbox - it switches to 
percentage. But while seeing a single index, it shows number.

The percentage also depends on the time range. If you change the time 
slider at the bottom of the chart, it considers - 0% as the baseline from 
the time the chart started.
How do you take care of the number and percentage swapping and calculate 
percentage change so fast? I am developing a similar chart and started with 
Google's Annotated TimeLine chart.   Link to chart 
<https://developers.google.com/chart/interactive/docs/gallery/annotationchart?hl=ja#Methods>
 .


Any help would be appreciated.

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