Country Populations

Data from the World Bank (download). Uses d3js.

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

body {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.bar {
  fill: steelblue;
}

.x.axis path {
  display: none;
}

.legend line {
  stroke: #000;
  shape-rendering: crispEdges;
}

</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
    height = 500,
    radius = Math.min(width, height) / 2;

var color = d3.scale.ordinal()
    .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);

var arc = d3.svg.arc()
    .outerRadius(radius - 10)
    .innerRadius(radius - 100);

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

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

var tooltip = svg.append('g')
    .attr('transform', 'translate(' + 0 + ',' + 0 + ')')
    .append('text')
    .attr('text-anchor', 'middle');

svg
        .on('mouseover', function() {
            var d = d3.select(d3.event.target);
            if (d) d = d.data()[0];
            if (d && d.data && d.data.Economy) tooltip.text(d.data.Economy + ': ' +
                d3.format(',')(d.data.pop) + ' (' + (100 * d.data.pop / total).toFixed(1) + '%)');
        })
        .on('mouseout', function() {
            tooltip.text('');
        })

d3.csv("pop.csv", function(error, data) {

data.forEach(function(d) {
    d.pop = +(d.pop.replace(/\,/g, '')) * 1000;
  });

total = data.reduce(function(mem, d) {
      return mem + d.pop;
  }, 0);

var g = svg.selectAll(".arc")
      .data(pie(data))
    .enter().append("g")
      .attr('title', function(d) { return d.data.Country; })
      .attr("class", "arc");

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

g.append("text")
      .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
      .attr("dy", ".35em")
      .style("text-anchor", "middle")
      .text(function(d) {
          return (d.endAngle - d.startAngle > 0.1) ? d.data.Country : '';
      });

});

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js