OpenStreetMap Contributors By Month By Edits Per Month

<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  font: 10px sans-serif;
}

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

path.area {
    fill: #c6dbef;
}

path.line {
    stroke: steelblue;
    fill: transparent;
}

text.title {
    font:20px sans-serif;
    fill: #222;
}

text.key-title {
    font:bold 16px sans-serif;
    text-anchor:middle;
}

</style>
<body>
<script src="https://d3js.org/d3.v2.min.js?2.10.0"></script>
<script>

d3.json('five_stack.json', function(values) {
    values = values.map(function(values) {
        for (var i = 0; i < values.length; i++) {
            values[i].x = new Date(values[i].x * 1000);
        }
        return values;
    });

var formatCount = d3.format(",.0f");

var margin = {top: 10, right: 100, bottom: 30, left: 30},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.time.scale()
    .domain([
    d3.min(values[0], function(d) { return d.x }),
    d3.max(values[0], function(d) { return d.x })])
    .range([0, width]);

var y = d3.scale.linear()
    .domain([0, d3.max(values.map(function(v) { return d3.max(v, function(d) { return d.y; })}))])
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("right");

var svg = d3.select("body").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 + ")");

var area = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.x); })
    .y0(height)
    .y1(function(d) { return y(d.y); });

svg.append("text")
    .attr({ x: 10, y: 20, 'class': 'title' })
    .text('Active contributors to OpenStreetMap per Month');

var PRGn = ["rgb(123,50,148)","rgb(194,165,207)","rgb(247,247,247)","rgb(166,219,160)","rgb(0,136,55)"];

var z = d3.scale.ordinal()
    .domain(d3.range(5))
    .range(PRGn);

var circles = svg.selectAll('g.key')
    .data(d3.range(5))
    .enter()
    .append('g')
    .attr('class', 'key')
    .attr('transform', function(d) { return 'translate(' + (30 + d * 50) + ',60)'; });

circles.append('circle')
    .attr('r', 20)
    .style("fill", function(d, i) { return z(i); });

circles.append('circle')
    .attr('r', 15)
    .style("fill", '#fff');

circles.append('text')
    .attr('class', 'key-title')
    .attr('dy', 5)
    .text(function(d) { return d; });

svg.selectAll('path.area')
    .data(values)
    .enter()
    .append('path')
    .attr("class", "area")
    .style("fill", function(d, i) { return z(i); })
    .attr('d', area);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(" + width + ", 0)")
    .call(yAxis);

});
</script>

Modified http://d3js.org/d3.v2.min.js?2.10.0 to a secure url

https://d3js.org/d3.v2.min.js?2.10.0