have my json response as

{"data":[
{
"percentage":94.3,
"population":53193
}]
}

I'm trying to insert the data to span is

My Javascript

$.post("<?php echo $baseUrl . '/population'; ?>", function(data) {
                $('.percentage').text(parseFloat(data.percentage));
                $('.population').text(parseInt(data.population));
            }, 'JSON');

Im getting NaN How do i resolve this