Pie_Chart_With%

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

.arc text {
  font: 12px sans-serif;
  text-anchor: middle;
  font-weight: bold;
}

.arc path {
  stroke: #fff;
}

</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height"),
    radius = Math.min(width, height) / 2.25,
    g = svg.append("g").attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

var color = d3.scaleOrdinal(['#67bf5c','#ff9e4a','#6dccda','#ad8bc9','#ed665d', '#cdcc5d', '#a8786e',  '#729ece', '#a2a2a2','#ed97ca']);

var pie = d3.pie()
    .sort(null)
    .value(function(d) { return d.total; });

var path = d3.arc()
    .outerRadius(radius - 10)
    .innerRadius(0);

var label = d3.arc()
    .outerRadius(radius - 40)
    .innerRadius(radius - 40);
 
  
var percentageFormat = d3.format(".2%",);
/*
d3.csv("data.csv", function(d) {
  d.population = +d.population;
  return d;
}, function(error, data) {
  if (error) throw error;*/

d3.json("data.json", function(error, data) {
  
  var tots = d3.sum(data, function(d) { 
            return d.total; 
        });
  
data.forEach(function(d) {
   // d.leads_intended_storage_duration_tiers = (d.leads_intended_storage_duration_tiers);
    d.total = +d.total;
    d.percentage = d.total  / tots;
  });

var arc = g.selectAll(".arc")
    .data(pie(data))
    .enter().append("g")
     .attr("class", "arc");

arc.append("path")
      .attr("d", path)
      .attr("fill", function(d) { return color(d.data.leads_intended_storage_duration_tiers); });

arc.append("text")
      .attr("transform", function(d) { return "translate(" + label.centroid(d) + ")"; })
      .attr("dy", "0.35em")
      .style("text-anchor", "middle")
      .text(function(d) { return d.data.leads_intended_storage_duration_tiers; })
  
  arc.append("text")
      .attr("transform", function(d) {
        var _d = path.centroid(d);
        _d[0] *= 2.3;	//multiply by a constant factor
        _d[1] *= 2.3;	//multiply by a constant factor
        return "translate(" + _d + ")";
      })
      .attr("dy", ".50em")
  		.style("text-anchor", "middle")
      .text(function(d) {
                	console.log("d is", d);
                    return percentageFormat(d.data.percentage);})

});

</script>

https://d3js.org/d3.v4.min.js