Children of elementary classes are normally separated from other classes within their own floor of a school building. They are taught, ideally, by a single teacher through all four elementary years (except for physical training and, if available, foreign languages); 98.5% of elementary school teachers are women. Their number decreased from 349,000 in 1999 to 317,000 in 2005. Starting from the fifth year, each academic subject is taught by a dedicated subject teacher (80.4% women in 2004, an increase from 75.4% in 1991). Pupil-to-teacher ratio (11:1) is on par with developed European countries. Teachers' average monthly salaries in 2008 range from 6,200 roubles (200 US dollars) in Mordovia to 21,000 roubles (700 US dollars) in Moscow.