 Complete the following phrase:  The heptathlon has been contested by female athletes since the early 1980s, when it replaced the pentathlon as the primary womens combined event contest the javelin throw and 800 m were added. It was first contested at the Olympic level in the 1984 Summer Olympics. In recent years some womens decathlon competitions have been conducted, consisting of the same events as the mens competition in a slightly different order, and the IAAF has begun keeping records for it, but the heptathlon remains the championship-level combined event for women. Nafissatou Thiam, representing Belgium, is the 2020 Olympic Gold Medallist, after successfully defending her 