...resizing with the Selection tool and the Ctrl or Command key changes the frame and the content, but not the scale percentage in the Transform and Control palette. This method works the same way on frames with graphic content, text inside of text frames, and objects in a group...
...to track the percentage change of path dimensions, use the Scale tool or Scale dialog box (double-click the Scale tool) instead of using the Transform or Control palette...
...you can also scale objects in 1% or 5% increments, similar to the way you can nudge an object’s position with the arrow keys. When you use this method to change the dimensions of a path, the Transform and Control palettes report the path’s new height and width as 100%. When you use this method to change the dimensions of a graphic, the Transform palette reports the graphic’s new height and width as a percentage of its original dimension. This lets you easily reset a graphic to 100% at any time, by typing 100% into the graphic’s dimensions in the Transform or Control palette...
Andrew