score:1

Added the code with a dummy dataset. The shape of dataset is similar to one specified by you. You just need to use it the way it is shown in example given by you.

Two changes you need to do:

  1. Change the parsing of date. Replace with below line:

    var parseDate = d3.time.format("%d/%m/%Y").parse

  2. Use different logic for coloring as we have more countries data.

    var path = svg.selectAll(".company").append("path") .attr("class", "line") .attr("d", function(d) { return line(d.values); }) .style("stroke", function(d) { return color(d.name) });

<!DOCTYPE html>
<meta charset="utf-8">
<style>
  body {
    font: 12px Helvetica;
  }
  
  .axis line {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
  }
  
  .x.axis path {
    display: none;
  }
  
  .line {
    fill: none;
    stroke: steelblue;
    stroke-width: 2px;
  }
</style>

<body>
  <script src="https://d3js.org/d3.v3.js"></script>
  <script>
    var margin = {
        top: 20,
        right: 50,
        bottom: 30,
        left: 50
      },
      width = 630 - margin.left - margin.right,
      height = 400 - margin.top - margin.bottom;
    debugger;
    var parseDate = d3.time.format("%d/%m/%Y").parse;

    var x = d3.time.scale()
      .range([0, width]);

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

    var color = d3.scale.category10();

    var xAxis = d3.svg.axis()
      .scale(x)
      .ticks(5)
      .innerTickSize(15)
      .outerTickSize(0)
      .orient("bottom");

    var yAxis = d3.svg.axis()
      .scale(y)
      .tickFormat(function(d) {
        return d + "%";
      })
      .ticks(5)
      .innerTickSize(15)
      .outerTickSize(0)
      .orient("left");

    var line = d3.svg.line()
      .interpolate("basis")
      .x(function(d) {
        return x(d.date);
      })
      .y(function(d) {
        return y(d.price);
      });


    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 + ")");

    data = [{
        date: '1/31/1995',
        Austria: '23',
        Belgium: '14',
        Bulgaria: '-96',
      },
      {
        date: '1/31/1996',
        Austria: '-23',
        Belgium: '114',
        Bulgaria: '50',
      },
      {
        date: '1/31/1997',
        Austria: '27',
        Belgium: '-14',
        Bulgaria: '96',
      },
    ]

    color.domain(d3.keys(data[0]).filter(function(key) {
      return key !== "date";
    }));

    data.forEach(function(d) {
      d.date = parseDate(d.date);
    });

    var companies = color.domain().map(function(name) {
      return {
        name: name,
        values: data.map(function(d) {
          return {
            date: d.date,
            price: +d[name]
          };
        })
      };
    });


    x.domain(d3.extent(data, function(d) {
      return d.date;
    }));

    y.domain([
      d3.min(companies, function(c) {
        return d3.min(c.values, function(v) {
          return v.price;
        });
      }),
      d3.max(companies, function(c) {
        return d3.max(c.values, function(v) {
          return v.price;
        });
      })
    ]);

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

    svg.append("g")
      .attr("class", "y axis")
      .call(yAxis);


    svg.append("line")
      .attr({
        "class": "horizontalGrid",
        "x1": 0,
        "x2": width,
        "y1": y(0),
        "y2": y(0),
        "fill": "none",
        "shape-rendering": "crispEdges",
        "stroke": "black",
        "stroke-width": "1px",
        "stroke-dasharray": ("3, 3")
      });


    var company = svg.selectAll(".company")
      .data(companies)
      .enter().append("g")
      .attr("class", "company");



    var path = svg.selectAll(".company").append("path")
      .attr("class", "line")
      .attr("d", function(d) {
        return line(d.values);
      })
      .style("stroke", function(d) {
        return color(d.name)
      });



    var totalLength = path.node().getTotalLength();

    d3.select(path[0][0])
      .attr("stroke-dasharray", totalLength[0] + " " + totalLength[0])
      .attr("stroke-dashoffset", totalLength[0])
      .transition()
      .duration(5000)
      .ease("linear")
      .attr("stroke-dashoffset", 0);

    d3.select(path[0][1])
      .attr("stroke-dasharray", totalLength[1] + " " + totalLength[1])
      .attr("stroke-dashoffset", totalLength[1])
      .transition()
      .duration(5000)
      .ease("linear")
      .attr("stroke-dashoffset", 0);
  </script>


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