| Cities | Population | Availability |
Aachen, North Rhine-Westphalia, Germany |
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Bielefeld, North Rhine-Westphalia, Germany |
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Bochum, North Rhine-Westphalia, Germany |
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Bonn, North Rhine-Westphalia, Germany |
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Cologne, North Rhine-Westphalia, Germany |
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Dortmund, North Rhine-Westphalia, Germany |
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Duisburg, North Rhine-Westphalia, Germany |
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Düsseldorf, North Rhine-Westphalia, Germany |
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Essen, North Rhine-Westphalia, Germany |
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Gelsenkirchen, North Rhine-Westphalia, Germany |
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Hagen, North Rhine-Westphalia, Germany |
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Hamm, North Rhine-Westphalia, Germany |
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Herne, North Rhine-Westphalia, Germany |
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Krefeld, North Rhine-Westphalia, Germany |
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Leverkusen, North Rhine-Westphalia, Germany |
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Mönchengladbach, North Rhine-Westphalia, Germany |
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Mülheim an der Ruhr, North Rhine-Westphalia, Germany |
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Münster, North Rhine-Westphalia, Germany |
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Oberhausen, North Rhine-Westphalia, Germany |
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Solingen, North Rhine-Westphalia, Germany |
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Wuppertal, North Rhine-Westphalia, Germany |
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