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Word: penetrations (lookup in dictionary) (lookup stats)
Dates: during 175956-175956
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Word Time Machine

Normalized population density for word "penetrations" throughout decades:

1910s : 0.9966
1920s : 0.3699
1930s : 0.5604
1940s : 3.2347
1950s : 1.1223
1960s : 1.2472
1970s : 1.1392
1980s : 0.9826
1990s : 0.8374
2000s : 0.3838