You can click on Preview and the ring graphic on the right will adjust the percentage depending on how many data of the Referrer Spam removes.
Now combining these 2 solutions, stopping and removing, you can see your reports without these 3 nasty spammers.
If you know of any other Spammer that is affecting you can write it in the comments and I will add it to the list http://www.ohow.co/what-is-referrer-spam-how-stop-it-guide/#Referrer_Spam_List