title: Display percentage on tooltip highchart Angular 2
body: <p>Hi I have the following highchart configuration for a normal column chart with percentage values.</p>
  
  <pre><code>private _attendanceInputData: any = {
  
          chart: { type: 'column' },
          title : { text : 'Daily Attendance Overview' },  
  
          xAxis: {
              categories: this._weekValues
          },
          yAxis: {
              allowDecimals: false,
              title: { text: ''},
              min: 0,
              max: 100,
              labels: {
                  formatter:function() {
                      console.log(this.value); //0, 25, 50 , 75 , 100
                      var pcnt = (this.value / 100) * 100;
                      return pcnt + '%';
                  }
              }
          },
          credits: {
            enabled: false
          },
          series: [
              {
                  name: 'Students',
                  data: this._studentAttendance,
                  color: '#3366cc'
              },{
                  name: 'Staff',
                  data: this._staffAttendance,
                  color: '#accbfc',
              }
          ]
      };
  </code></pre>
  
  <p>But the tooltip now showing the value but not displaying "%" after the value. How to do that? Sorry am new to highcharts. Thanks in advance guys.</p>