Research about Bulgaria :)

I researched Bulgaria because I like yoghurt so much. It is the famous person was born in Bulgaria. It is Asashoryu. He is very famous sumo wrestler in Japan so, I was very interested in Bulgaria and I wanted to learn about many things in Bulgaria. I think that differences between Japan and Bulgaria, it is the number of GDP. It means the total value of all goods and services produced in a country, in one year, except for income received from abroad. But, there are also same things in two countries. It is the snow in the winter and very cold in. I want to 10 questions about Bulgaria and continue to research. Thank you :)