Other researchers have found that glaciers across the Alps appear to be retreating at a faster rate than a few decades ago. In a paper published in 2009 by the University of Zurich, the Swiss glacier survey of 89 glaciers found 76 retreating, 5 stationary and 8 advancing from where they had been in 1973. The Trift Glacier had the greatest recorded retreat, losing of its length between the years 2003 and 2005. The Grosser Aletsch Glacier is the largest glacier in Switzerland and has been studied since the late 19th century. Aletsch Glacier retreated from 1880 to 2009. This rate of retreat has also increased since 1980, with 30%, or , of the total retreat occurring in the last 20% of the time period.