google charts sankey multilevel tutorial

Code

<!DOCTYPE html>
<html>
<head>
<title>Google Charts tutorial Tutorial</title>
   <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
   <script type="text/javascript" src="https://www.google.com/jsapi"></script>
   <script type="text/javascript">
     google.charts.load('current', {packages: ['sankey']});     
   </script>
</head>
<body>
<div id="container" style="width: 550px; height: 400px; margin: 0 auto"></div>
<script language="JavaScript">
function drawChart() {
// Define the chart to be drawn.
   var data = new google.visualization.DataTable();   
   data.addColumn('string', 'From');
   data.addColumn('string', 'To');
   data.addColumn('number', 'Weight');

data.addRows([
      [ 'Brazil', 'Paris', 5 ],
      [ 'Brazil', 'France', 1 ],
      [ 'Brazil', 'Spain', 2 ],
      [ 'Brazil', 'China', 3 ],
      [ 'Canada', 'Paris', 4 ],
      [ 'Canada', 'France', 5 ],
      [ 'Canada', 'Spain', 1 ],
      [ 'Mexico', 'Paris', 2 ],
      [ 'Mexico', 'France', 3 ],
      [ 'Mexico', 'Spain', 5 ],
      [ 'Mexico', 'China', 1 ],
      [ 'USA', 'Paris', 2 ],
      [ 'USA', 'France', 3 ],
      [ 'USA', 'Spain', 4 ],
      [ 'USA', 'China', 5 ],
	  [ 'Portugal', 'Angola', 2 ],
      [ 'Portugal', 'japan', 5 ],
      [ 'Portugal', 'Morocco', 4 ],
      [ 'Portugal', 'South Africa', 3 ],
      [ 'France', 'Angola', 1 ],
      [ 'France', 'japan', 3 ],
      [ 'France', 'Mali', 2 ],
      [ 'France', 'Morocco', 4 ],
      [ 'France', 'South Africa', 5 ],
      [ 'Spain', 'japan', 1 ],
      [ 'Spain', 'Morocco', 2 ],
      [ 'Spain', 'South Africa', 3 ],
      [ 'England', 'Angola', 4 ],
      [ 'England', 'japan', 5 ],
      [ 'England', 'Morocco', 2 ],
      [ 'England', 'South Africa', 7 ],
      [ 'South Africa', 'los angeles', 5 ],
      [ 'South Africa', 'India', 2 ],
      [ 'South Africa', 'Malaysia', 3 ],
      [ 'Angola', 'los angeles', 5 ],
      [ 'Angola', 'India', 4 ],
      [ 'Angola', 'Malaysia', 3 ],
      [ 'Senegal', 'China', 5 ],
      [ 'Senegal', 'India', 2 ],
      [ 'Senegal', 'Malaysia', 3 ],
      [ 'Mali', 'los angeles', 5 ],
      [ 'Mali', 'India', 4 ],
      [ 'Mali', 'Malaysia', 3 ],
      [ 'Morocco', 'los angeles', 5 ],
      [ 'Morocco', 'India', 2 ],
      [ 'Morocco', 'Malaysia', 3 ]
   ]);

// Set chart options
   var options = {
      width: 550
   };
		
   // Instantiate and draw the chart.
   var chart = new google.visualization.Sankey(document.getElementById('container'));
   chart.draw(data, options);
}
google.charts.setOnLoadCallback(drawChart);
</script>
</body>
</html>

Result