Fatal Encounters Deaths by Year

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

.bar {
  fill: lightslategray;
}

.axis {
  font: 10px sans-serif;
}

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

.x.axis path {
  display: none;
}

</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>

var sourceUrl = "https://numeracy.co/projects/45gLWhWroC/fatal-encounters-summary.csv"

function groupBy(d) {
	return (new Date(d.Date)).getFullYear()
}
  
function xValue(d) {
  return x(d.key);
}
  
function yValue(d) {
  return y(d.values.length);
}

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

var y = d3.scale.linear()
    .range([height, 0]);

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

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(5);

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 + ")");

d3.csv(sourceUrl)
  .get(function(error, data) {
  if (error) throw error;
  
	var deathsByYear = d3.nest()
  	.key(groupBy)
  	.entries(data)

x.domain(deathsByYear.map(function(d) { return d.key; }));
  y.domain([0, d3.max(deathsByYear, function(d) { return d.values.length })])

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(-3," + height + ")")
      .call(xAxis);

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Deaths");

svg.selectAll(".bar")
      .data(deathsByYear)
    .enter().append("rect")
  		.attr("y", 500)
      .attr("class", "bar")
      .attr("x", xValue)
      .attr("width", x.rangeBand())
      .attr("y", yValue)
      .attr("height", function(d) { return height - yValue(d); });
});

</script>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js