Ruth2, I don't know how recent of a change you are asking about, but I found some information
at this website. It states that non-identifying information is available to the adoptive parents, the birth parents, and the adopted child after the age of 18. That's the first part of the information--I'll let you read the other particulars yourself.
If you need more information that you can't find from an internet search, please feel free to post again.