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Word: ridges (lookup in dictionary) (lookup stats)
Dates: during 1970-1979
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Word Time Machine

Normalized population density for word "ridges" throughout decades:

1870s : 1.3206
1880s : 0.1331
1890s : 0.7156
1900s : 0.4339
1910s : 0.1182
1920s : 0.7021
1930s : 1.3964
1940s : 2.0469
1950s : 1.7578
1960s : 1.4058
1970s : 1.1039
1980s : 0.5130
1990s : 0.4570
2000s : 0.8083
2010s : 0.2819