ChartJS - Line Chart - Y axis scale problem ?

Line Chart - Y axis scale problem ?

HTML

<script src="http://www.chartjs.org/assets/Chart.js"></script>
<body>
  <h3>Working Chart</h3>
  <canvas id="canvas" height="450" width="600"></canvas>
</body>

CSS

canvas {
  background-color: #eee;
}

JavaScript

var lineChartData = {
  datasets: [{
    label: "First label",
    fillColor: "rgba(220,220,220,0.2)",
    strokeColor: "rgba(220,220,220,1)",
    pointColor: "rgba(220,220,220,1)",
    pointStrokeColor: "#fff",
    pointHighlightFill: "#fff",
    pointHighlightStroke: "rgba(220,220,220,1)",
    data: [0, 0, 0, 0, 0, 0, 69, 0, 0, 0, 0, 0, 16, 0, 100, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
  }, {
    label: "Second label",
    fillColor: "rgba(151,187,205,0.2)",
    strokeColor: "rgba(151,187,205,1)",
    pointColor: "rgba(151,187,205,1)",
    pointStrokeColor: "#fff",
    pointHighlightFill: "#fff",
    pointHighlightStroke: "rgba(151,187,205,1)",
    data: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 100, 0, 16, 0, 0, 0, 0, 0, 69, 0, 0, 0, 0, 0, 0]
  }],
  "labels": ["Dec 22", "Dec 23", "Dec 24", "Dec 25", "Dec 26", "Dec 27", "Dec 28", "Dec 29", "Dec 30", "Dec 31", "Jan 1", "Jan 2", "Jan 3", "Jan 4", "Jan 5", "Jan 6", "Jan 7", "Jan 8", "Jan 9", "Jan 10", "Jan 11", "Jan 12", "Jan 13", "Jan 14", "Jan 15", "Jan 16", "Jan 17", "Jan 18", "Jan 19", "Jan 20"]
};

var myLine = new Chart(document.getElementById("canvas").getContext("2d")).Line(lineChartData);