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Word: perpetual (lookup in dictionary) (lookup stats)
Dates: during 1930-1939
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Word Time Machine

Normalized population density for word "perpetual" throughout decades:

1870s : 1.0117
1880s : 0.9683
1890s : 0.5254
1900s : 1.1635
1910s : 0.6114
1920s : 1.5799
1930s : 1.2225
1940s : 0.8452
1950s : 1.0099
1960s : 1.1194
1970s : 1.0613
1980s : 0.9422
1990s : 0.8981
2000s : 0.9069
2010s : 0.7559