Based on historical context, it became more common for middle-class people to visit the desert around the 1970s.
Desert Tourism
The desert, among other places, became a tourist attraction for much middle class in the 1970s when the Europeans began to journey around the world.
During this period, many middle-class and their families from Europe and American goes to the desert places to have the feel of the Mediterranean sun and sea vacation.
Hence, in this case, it is concluded that the correct answer is "1970s.
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