Incorrect argument passed to addEventListener to a HTMLElement using a for loop

Question

Link to jsFiddle: http://jsfiddle.net/6Y8FU/

I'm querying all tr.tableWinkelwagen-productItem in this table using:

var productItemAll = document.querySelectorAll(".tableWinkelwagen-productItem")

This is the tabel:

                <table class="tableWinkelwagen">
                    <tr>
                        <th>Product(en)</th>
                        <th>Prijs</th>
                        <th>Aantal</th>
                        <th>Totaal</th>
                        <th></th>
                    </tr>
                    <tr class="tableWinkelwagen-productItem" data-id="1">
                        <td>Treinreis Utrecht - Boedapest <br> <small>05/08/2014 - 05/08/2014</small></td>
                        <td>€<span class="priceUnit">170</span>,-</td>
                        <td><div class="boxNumbers"><i class="glyphicon glyphicon-minus-sign boxNumbers-min"></i> <input type="text" class="boxNumbers-input priceAmount" placeholder=""> <i class="glyphicon glyphicon-plus-sign boxNumbers-plus"></i></div></td>
                        <td>€<span class="priceTotal">340</span>,-</td>
                        <td><a href="" class="glyphicon glyphicon-trash"></a></td>
                    </tr>
                    <tr class="tableWinkelwagen-productItem" data-id="1">
                        <td>Treinreis Utrecht - Boedapest <br> <small>05/08/2014 - 05/08/2014</small></td>
                        <td>€<span class="priceUnit">170</span>,-</td>
                        <td><div class="boxNumbers"><i class="glyphicon glyphicon-minus-sign boxNumbers-min"></i> <input type="text" class="boxNumbers-input priceAmount" placeholder=""> <i class="glyphicon glyphicon-plus-sign boxNumbers-plus"></i></div></td>
                        <td>€<span class="priceTotal">340</span>,-</td>
                        <td><a href="" class="glyphicon glyphicon-trash"></a></td>
                    </tr>
                    <tr>
                        <td><strong>Totaal</strong></td>
                        <td></td>
                        <td></td>
                        <td>€<span>340</span>,-</td>
                        <td></td>
                    </tr>
                </table>

This, of course, gives me a nodeList with the 2 tr's.

I'm then adding an eventListener to each of the i.boxNumbers-min inside a tr using this code:

    function addEventListenerToMinPlus(){

        var x, y

        for(var i = 0; i < productItemAll.length; i++){

            x = productItemAll[i].querySelector(".boxNumbers-min")
            x.addEventListener("click", function(){updateProduct(i)})

            console.log(x)


        }

    }

The console prints out both tr's fine but when i execute the function updateProduct(i), initiated with a click i get a popop with the value 2 and not "0" and "1".

    function updateProduct(jow){

        alert(jow)


    }

Why do i always get the value "2" and not "0" or "1" when clicking on the i.boxNumbers-min buttons?

Link to jsFiddle: http://jsfiddle.net/6Y8FU/