I took the GRE's last year and retook them again this year. Funny thing is ETS only sent out this years scores, because at it happens, every time any part of your information is changed this creates a new file. So say I list school X, this year they would only recieve my new scores. My information that changed is my address. While this is bad news for me because my scores went up in one subject and down in another, this is good news for everyone who doesn't want their previous scores seen.