I looked at the Family History Library films of Cologne (Köln) births on FHL film #1237879. There are many others for birth, marriages, & deaths by year.
Just go to familysearch.org, click on Library, then Family History Library catalog, then chose Place Search. Type in Cologne, part of Germany. Then click on the name till you get a list of records. Under Church Records (Kirkenbuch) chose the denomination and year you want.
These records are NOT available to German citizens. I don't know why. Order it at your local Mormon church for viewing. (The website also lists where to find your local Mormon church with facilities).
Hope this helps.