As a 64 year old adopted woman I would urge you to give very serious consideration to revising the access laws concerning an adopted person's rights to his/her birth certificate and adoption agency information.
I have been very fortunate in that I have successfully located my birth family in the past two years, absolutely without the assistance of the Adoption Board, and while I will admit that not all outcomes are as happy as mine, surely every adopted person has a basic right to their identity. You are lucky that you can trace your own family back through the generations without even thinking about it, and I know that those who have not been adopted find it difficult to understand our need to establish our identity, but just think that at the moment our identity only begins with ourselves, and we have no reference to a past generation for similarities of features, personalities, and most important of all, medical conditions.
I have a non-threatening condition called Vitiligo, and have discovered that my birth mother also had it, and no doubt I will pass it on to another generation.
I have a daughter who is coeliac, and although I sometimes have a dodgy stomach, this is something else probably inherited. These of course are very minor conditions compared with someone with a life-threatening illness who perhaps could be helped if family history were available.
Please, please look at these laws again. There are many people out there depending on you. Don't let them down.