Understanding Society User Support

Hi,
I am from the university trier in germany and need to do a one year
reasearch project with the topic "union membership and job
satisfaction". Therefore I am looking for data that include
information about union entry and exit. Could you tell me which waves
are adequate for my topic and how I get access to it?
I would like to work with it as fast as possible :)
Thank you in advance!

Best regards,
Lisa