When did Deutsche Post raise the postage on letters to other countries in Europe from 55 cents to 70 cents?

I liked it being the same in Germany and the rest of Europe, at least for normal weights.

At all events, they have no 15-cent stamps to make up the sum, just the usual 5c and 10c, all boring flowers. I fear a lot of people are going to get the stamp Alte Rheinbrücke Bad Säckingen in future weeks.

There are a couple of 65c stamps that are OK (Riga and Frankfurt zoological society) if one adds the 5c crocus.
Some pictures here (if you click on the name).