ActionScript 3.0 :: Simple Bar Graph - Populating Popup Box?

I'm fairly new to Actionscript 3, I'm creating a simple bar graph. There are 5 movie clips relating to years {mcYear0, mcYear1, mcYear2, mcYear3, and mcYear4} then there are 6 bars in each year representing animal population (all the animal movieclips nested in the years are named the same from year to year, so mcFrogs in mcYear1 is also mcFrogs in mcYear2). When you roll over an animal, I want a box to pop up and populate that animal's population over the years. I'm not worried about populating the box but for some reason my code to make the box pop up on the animals is only working on the last year (mcYear4).

Here is my code:
mcYear0.addEventListener(Event.ENTER_FRAME, HOver);
mcYear1.addEventListener(Event.ENTER_FRAME, HOver);
mcYear2.addEventListener(Event.ENTER_FRAME, HOver);
mcYear3.addEventListener(Event.ENTER_FRAME, HOver);
mcYear4.addEventListener(Event.ENTER_FRAME, HOver);
function HOver(e:Event) {
[Code] .....