How to properly get text width to center labels above graph bars?

I currently have a graph that has associated bar values displaying above each bar, but I'm having difficulty centering the value labels, due to not being able to fetch each text element's width.

This is how my graph is drawing at the moment:

All I need to do is to subtract half of each text element's width, but I can't seem to do so with the following Coffeescript:

    #Drawing value labels   
    svg.selectAll("rect")
        .data(data)
        .enter()
        .append("text")
        .text((d)-> d.Total)
        .attr("width", x.rangeBand())
        .attr("x", (d)->
            textWidth = d3.selectAll("text").attr("width")

            x(d.Year) + (x.rangeBand() / 2) - (textWidth / 2)
        )
        .attr("y", (d)-> y(d.Total) - 5)
        .attr("font-size", "10px")
        .attr("font-family", "sans-serif")

    #Drawing bars       
    svg.selectAll("rect")
        .data(data)
        .enter().append("rect")
        .attr("class", "bar")
        .attr("x", (d)-> x(d.Year))
        .attr("width", x.rangeBand())
        .attr("y", (d)-> y(d.Total))
        .attr("height", (d)-> height - y(d.Total))

Is there a way that I can access each text element's width attribute to set a value to offset?