Hanshin accounts for 60% of the population in Hyogo. It is highly industrialized, especially around the international port city of Kobe, which is Hyogo's largest city and capital. To avoid potential population concentration problems, Hanshin continually develops complex environmental controls and regional redevelopment programs. Shipbuilding and steel manufacturing have historically been the leading industries of Hanshin, while new technologies such as biotechnology and high technology have also begun to thrive there. Hanshin is a brewing center for many of Japan's most prestigious sake brands and is the world's source of Kobe beef. The city of Takarazuka in Hanshin is home to Takarazuka Revue, a famous all-female musical theater troupe that's been performing since 1913.