Unfortunately I didn't find more actual stats, but there is a report from Deutsche Bundesbank (German Federal Bank) from 2014 which states that in 2014 the share of cash payments in Germany was 79.1% and only 1.3% credit card transactions.[0, page 27] If I remember correctly, there is no other European country with such a low percentage of credit card transactions.
[0] https://www.bundesbank.de/Redaktion/EN/Downloads/Publication... [PDF]