a) Change pattern of "grassland in a broad sense" from the 1880s. The "grasslands" of the 1880s and 1950s include broad-leaf forests and conifer forests and the "grasslands" since the 1980s include only grassland. () shows the proportion of the area occupied in the grassland of the previous periods. b) Estimated age of grasslands in a broad sense existing in the 2000s (1,229 ha). c) Distribution and age of the remaining grassland in the 2000s.