Tokyo emerged as a leading international financial center (IFC) in the 1960s and has been described as one of the three "command centers" for the world economy, along with New York City and London. In the 2020 Global Financial Centers Index, Tokyo was ranked as having the fourth most competitive financial center in the world (alongside cities such as New York City, London, Shanghai, Hong Kong, Singapore, Beijing, San Francisco, Shenzhen and Zurich in the top 10), and second most competitive in Asia (after Shanghai). The Japanese financial market opened up slowly in 1984 and accelerated its internationalization with the "Japanese Big Bang" in 1998. Despite the emergence of Singapore and Hong Kong as competing financial centers, the Tokyo IFC manages to keep a prominent position in Asia. The Tokyo Stock Exchange is Japan's largest stock exchange, and third largest in the world by market capitalization and fourth largest by share turnover. In 1990 at the end of the Japanese asset price bubble, it accounted for more than 60% of the world stock market value. Tokyo had 8,460 ha (20,900 acres) of agricultural land as of 2003, according to the Ministry of Agriculture, Forestry and Fisheries, placing it last among the nation's prefectures. The farmland is concentrated in Western Tokyo. Perishables such as vegetables, fruits, and flowers can be conveniently shipped to the markets in the eastern part of the prefecture. ''Komatsuna'' and spinach are the most important vegetables; as of 2000, Tokyo supplied 32.5% of the ''komatsuna'' sold at its central produce market.