The indexed number of overnight stays in winter sports resorts in the winter half-year is shown by lines. The values are set to 100 for the winter of 1991/92. The time series extends to 2017/2018. For the Black Forest and the Alps there is a quadratically increasing trend, for the eastern and the western and central low mountain ranges there is no trend. The Skier Days, which are shown from 2010/11 to 2017/18, also show no trend.
Source: Statistical offices of federal states (monthly survey in tourism); Verband Deutscher Seilbahnen e.V. (Skier Days)
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