Other - Dropdown dynamically current year and previous year in html

<script>
function insertYears()
{
var now = new Date();
var thisYear = now.getFullYear();
var lastYear = parseInt(now.getFullYear()) - 1;
var new_opt_one = document.createElement("option");
var new_opt_two = document.createElement("option");
new_opt_one.value = thisYear;
new_opt_one.innerHTML = thisYear;
new_opt_two.value = lastYear;
new_opt_two.innerHTML = lastYear;
document.getElementById("YEAR").appendChild(new_opt_two);
document.getElementById("YEAR").appendChild(new_opt_one);
}
window.onload = function() {
insertYears();
}
</script>

<select name="YEAR" id="YEAR" >
<option value="" >Select the Year</option>
</select>