สอบถามเรื่อง การใส่ ค่า ของ แต่ละ Column ใน Google Chart ครับผม

// Load the Visualization API and the piechart package.
      google.load('visualization', '1.0', {'packages':['corechart']});
      
      // Set a callback to run when the Google Visualization API is loaded.
      google.setOnLoadCallback(drawChart);


      // Callback that creates and populates a data table, 
      // instantiates the pie chart, passes in the data and
      // draws it.
      function drawChart() {

      // Create the data table.
      var data = new google.visualization.DataTable();
      data.addColumn('string', 'Topping');
      data.addColumn('number', 'Slices');
      data.addRows([
        ['test1', 83.95],
        ['test2', 6.73],
        ['test3', 6.25], 
        ['test4', 3.06],
        ['test5', 0.01]
      ]);

      // Set chart options
      var options = {'title':'How Much Pizza I Ate Last Night',
                     'width':1000,
                     'height':700};

      // Instantiate and draw our chart, passing in some options.
      var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
      chart.draw(data, options);
    }