I suppose the answer to this question also depends on why you are asking. If you are thinking of selling the collection and want an idea of how much to ask, then the value of any tamagotchi collection will be influenced by more than just which type of tama you have listed.
People will pay different amounts for each tamagotchi based on things like:
condition of the tamas - scratches / marks, etc.
complete packaging / key chains, etc. or no packaging
design of tamagotchi shell - well known or rare design
It would be best if you spend some time looking through sites like ebay (for example) to see which tamagotchis are being offered and comparing them - shell design / packaging / condition, etc. with your own. This will give you a much more accurate idea of how much your collection is worth.
Once you have an idea of each tamas value you can add them all together to get an approximate value.
If you want to know because you are thinking of selling them then be aware that you may well find that you can get more money by selling them individually instead of a group.