Andrey Ermakov (Russian: Андрей Андреевич Ермаков ), (born May 27, 1987) is a Russian ballet dancer, a winner of 'Soul of Dance' award (Russian 'Ballet' magazine, 2013), who performs as a soloist with the Mariinsky Ballet (formerly the Kirov Ballet). Using only the above description and what you know about the world, "Andrey Ermakov was born in the 8th decade of the 20th century." is definitely correct, incorrect, or inconclusive? 