Chimney Sweeping in Germany

As an American chimney sweep I was very interested to know how the German chimney sweeps performed their work.

What do they inspect?
How many chimneys can they sweep per day?
What is involved in a chimney sweep in Germany?
Do Germans have to be certified?
How long is the German schooling program for chimney sweeps? Is it true that German chimney sweeps are required to access every home with a chimney every year and sweep it?