The decline of Romansh over the 20th century can be seen through the results of the Swiss censuses. The decline in percentages is only partially due to the Germanization of Romansh areas, since the Romansh-speaking valleys always had a lower overall population growth than other parts of the canton.
Reference 1: Romansh (absolute number), Romansh%, German% and Italian%.
Reference 2: 1803, 1850, 1880, 1900, 1920, 1941, 1960 and 1980.
Source: http://en.wikipedia.org/wiki/Romansh_language
Reference 2: 1803, 1850, 1880, 1900, 1920, 1941, 1960 and 1980.
Source: http://en.wikipedia.org/wiki/Romansh_language
