List of best-selling singles by year (Germany)

Columns: # | Artist | Artist 's nationality | Title
15 | Edward Maya featuring Vika Jigulina | Romania | Stereo Love | 16 | Empire of the Sun | Australia | We Are the People | 17 | Lady Gaga | United States | Bad Romance | 18 | Rihanna | Barbados | Only Girl ( In the World ) | 19 | Lady Gaga | United States | Alejandro | 20 | Katy Perry featuring Snoop Dogg | United States | California Gurls

Example questions:
What is the nationality of the best-selling artist in Germany in 2010 who was a Native Hawaiian singer-songwriter , musician , and Hawaiian sovereignty activist ? | What is the nationality of the band that was founded in 1999 and had a best-selling single in Germany in 2010 ? | What is the nationality of the duo that formed in 2009 and had a best-selling single in Germany in 2010 ? | What is the nationality of the artist who has sold over 8.5 million records worldwide and had a best-selling single in Germany in 2010 ?

Answers:
United States | Germany | United Kingdom | Belgium