Japans exports amounted to US$4,210 per capita in 2005. , Japans main export markets were the United States (20.2 percent), China (17.5 percent), South Korea (7.1 percent), Hong Kong (5.6 percent) and Thailand (4.5 percent). Its main exports are transportation equipment, motor vehicles, iron and steel products, semiconductors and auto parts. Japans main import markets  were China (24.8 percent), the United States (10.5 percent), Australia (5.4 percent) and South Korea (4.1 percent).
Question: Which market was China, and not the US, the number one partner of Japan's?
Answer: import markets