To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I only changed because the brand I have been using did not have large in the green. These are AWFUL. They do not stay on, seem to be thick and dry so they don't adhere as well, and my cat can pull them off. This was never possible with the other brand I used.