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HTML 

              
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">

<!-- Load d3.js & color scale -->
<script src="https://d3js.org/d3.v4.js"></script>
<script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
<style>
    font-family:Calibri (Body);
</style>
</head>

<body>

<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>

<script>

  // set the dimensions and margins of the graph
  var width = 450;
  var height = 450;
  var margin = 40;
  
  // The radius of the pieplot is half the width or half the height (smallest one). I subtract a bit of margin.
  var radius = Math.min(width, height) / 2 - margin;
  
  // append the svg object to the div called 'my_dataviz'
  var svg = d3.select("#my_dataviz")
    .append("svg")
      .attr("width", width)
      .attr("height", height)
    .append("g")
      .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
  
  // Create dummy data
  var data = {"<10": 64, "10-18": 83, "18-24":82, "25-34":98, "35-44":72, "45-54":66, "55-64":36, "65+":22};
  
  // set the color scale
  var color = d3.scaleOrdinal()
    .domain(["a", "b", "c", "d", "e", "f", "g", "h"])
    .range(d3.schemeDark2);
  
  // Compute the position of each group on the pie:
  var pie = d3.pie()
    .sort(null) // Do not sort group by size
    .value(function(d) {return d.value; });
  var data_ready = pie(d3.entries(data));
  
  // The arc generator
  var arc = d3.arc()
    .innerRadius(radius * 0.5)         // This is the size of the donut hole
    .outerRadius(radius * 0.8);
  
  // Another arc that won't be drawn. Just for labels positioning
  var outerArc = d3.arc()
    .innerRadius(radius * 0.96)
    .outerRadius(radius * 0.9);
  
        // Build the pie chart: Basically, each part of the pie is a path that we build using the arc function.
        svg
          .selectAll('allSlices')
          .data(data_ready)
          .enter()
          .append('path')
          .attr('d', arc)
          .attr('fill', function(d){ return(color(d.data.key)) })
          .attr("stroke", "white")
          .style("stroke-width", "3px")
          .style("opacity", 0.7)
        
        // Add the polylines between chart and labels:
        svg
          .selectAll('allPolylines')
          .data(data_ready)
          .enter()
          .append('polyline')
            .attr("stroke", "black")
            .style("fill", "none")
            .attr("stroke-width", 2)
            .attr('points', function(d) {
              var posA = arc.centroid(d) // line insertion in the slice
              var posB = outerArc.centroid(d) // line break: we use the other arc generator that has been built only for that
              var posC = outerArc.centroid(d); // Label position = almost the same as posB
              var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2 // we need the angle to see if the X position will be at the extreme right or extreme left
              posC[0] = radius * 0.95 * (midangle < Math.PI ? 1 : -1); // multiply by 1 or -1 to put it on the right or on the left
              return [posA, posB, posC]
            })
        
        // Add the polylines between chart and labels:
        svg
          .selectAll('allLabels')
          .data(data_ready)
          .enter()
          .append('text')
          .attr("font-family", "Calibri")
          
      
            .text( function(d) { console.log(d.data.key) ; return d.data.key } )
            .attr('transform', function(d) {
                var pos = outerArc.centroid(d);
                var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2
                pos[0] = radius * 1 * (midangle < Math.PI ? 1 : -1);
                pos1   = radius * 1 * (midangle < Math.PI ? 1 : -1);
                if(d.value == "7"){
                    return 'translate(153, -178)';
                }else{
                return 'translate(' + pos + ')';
                }


            })
            .style('text-anchor', function(d) {
                var midangle = d.startAngle + (d.endAngle - d.startAngle) / 3
                return (midangle < Math.PI ? 'start' : 'end')
            })
        
            svg.append("text")
            .attr("font-family", "Calibri")
   .attr("text-anchor", "middle")
   .text("Age became involved"); 
            
        
      
        </script>
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