The amateur Sumo World Championships has provided for female competition, as well as male, from when?

Question

When the amateur World Wrestling Championships combined events for men and women after 2003, the Championships were initially held in non-Olympic Games years, with the exception of 2008 and 2012. What was the reason for the exceptions?

Answer 1

2001
Female sumo was known in 5th century CE Japan. It was suppressed in the 19th century and officially banned in 1926. It lingered, even though prohibited in professional settings. The first national amateur women's championship was held in 1997.