Set random number and then randomly decrease it every 5 second until it reaches 0 (javascript)

I would like to set a random number between 200 and 300 and then randomly decrease it, step by step every 5 seconds, until it reaches 0.

I only have the beginning where i set the initial number

<div id="object_nb"></div>

<script>
function loadRandom() {
     var number_objects = 200 + Math.floor(Math.random() * 100);
      $('#object_nb').text(number_objects);
}
loadRandom(); // initial display
setInterval(function() {
     ???????? // it executes a random decrease every 5sec
  },5000);
</script>

How can I achieve this random decrease until 0 ?

Note: i would like to decrease each time the number by a random number ranging from 1 to 5 (not more)