While the site you linked to do not provide an API, the site I linked to, a different site, does provide an API. as I noted previously, I think this is for the same data set - but I cannot guarantee it.
Without the API, It would be significantly more difficult to do what you want on that web site. Not impossible, but definitely harder, and should they change the website in some way, it would be much more likely to break any automation. This is unlike the API, where changes would be more structured and are far more likely to be non-breaking - they are designed to work like that.