 Complete the following phrase:  Japan was not a major football force until the end of the 1980s, with a small and amateur team. Since the 1990s, when Japanese football became fully professionalized, Japan has emerged as one of the most successful teams in Asia; they have qualified for the last six FIFA World Cups with second round advancements in 2002, 2010, and 2018, and won the AFC Asian Cup a record four times, in 1992, 