Passage: The major international competition in football is the World Cup, organised by FIFA. This competition takes place every four years since 1930 with the exception of 1942 and 1946 tournaments, which were cancelled due to World War II. Approximately 190–200 national teams compete in qualifying tournaments within the scope of continental confederations for a place in the finals. The finals tournament, which is held every four years, involves 32 national teams competing over a four-week period. The World Cup is the most prestigious association football tournament in the world as well as the most widely viewed and followed sporting event in the world, exceeding even the Olympic Games; the cumulative audience of all matches of the 2006 FIFA World Cup was estimated to be 26.29 billion with an estimated 715.1 million people watching the final match, a ninth of the entire population of the planet. The current champion is France, which won its second title at the 2018 tournament in Russia. FIFA Women's World Cup has been held every four years since 1991. Under the tournament's current format, national teams vie for 23 slots in a three-year qualification phase. (The host nation's team is automatically entered as the 24th slot.) The current champion is the United States, after winning their third title in the 2015 FIFA Women's World Cup.

Question: Since when has there been  women's professional soccer championships?
1991