@paulfansare,
The method that calculates the minimum, maximum and other parameters is called only on rangeChanged event because of which table is populated only when you zoom/pan or reset the chart. To populate the table soon after rendering the chart, you need to call the method soon after chart.render().
chart.render();
showTableData(chart);
Please take a look at this Updated JSFiddle.
—
Vishwas R
Team CanvasJS