D3 Examples - Income per capita in poor countries

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  font-family: Helvetica;
}
.country-labels {
  font-size:11px;
}
.containers {
  float: left;
  margin-right: 10px;
  width: 120px;
  height: 100px;
}
.axis path,
.axis line {
  fill: none;
  stroke: #999;
  shape-rendering: crispEdges;
}
.axis text {
  fill: #999;
  font-size: 10px;
}
​
.y.axis path {
  display: none;
}
.line {
  fill: none;
  stroke: darkmagenta;
  stroke-width: 2.5px;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.js"></script>
<script>
var margin = {top: 30, right: 10, bottom: 20, left: 50};
    width = 120 - margin.left - margin.right,
    height = 90 - margin.top - margin.bottom;
​
var parseDate = d3.time.format("%Y").parse;
​
var x = d3.time.scale()
    .range([0, width])
​
var y = d3.scale.linear()
    .range([height, 0])
​
var xAxis = d3.svg.axis()
    .scale(x)
    .ticks(3)
    .tickFormat(d3.time.format("'%y"))
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .ticks(1, "$")
    .orient("left");
​
var line = d3.svg.line()
    .x(function(d) { return x(d.year); })
    .y(function(d) { return y(d.value); });
​
function compare(a,b) {
  if (a.key < b.key)
     return -1;
  if (a.key > b.key)
    return 1;
  return 0;
}
​
d3.csv("data.csv", function(error, data) {
    data.forEach(function(d) { 
      d.value = +d.value;
      d.year = parseDate(d.year);
    })
​
    x.domain(d3.extent(data, function(d) { return d.year; }))
    y.domain([0, d3.max(data, function(d) { return d.value; })])
​
    var nested = d3.nest()
      .key(function(d) { return d.Country; })
      .entries(data)
​
    nested = nested.sort(compare)
​
    var plots = d3.select("body").selectAll("div")
      .data(nested)
    .enter().append("div")
      .attr("class", "containers")
    .append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
    .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
    plots.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
​
    plots.append("g")
      .attr("class", "y axis")
      .call(yAxis)
​
    plots.append("path")
      .datum(function(d) {
        return d.values; 
      })
      .attr("class", "line")
      .attr("d", line)
​
    plots.append("text")
      .attr("transform", "translate(" + (width/2) + ",-5)")
      .attr("text-anchor","middle")
      .attr("class", "country-labels")
      .text(function(d) { return d.key; })
​
})
​
​
</script>
​
    