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Word: efficacy (lookup in dictionary) (lookup stats)
Dates: during 177166-177166
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Word Time Machine

Normalized population density for word "efficacy" throughout decades:

1870s : 0.8695
1880s : 0.6424
1890s : 0.3665
1900s : 0.5079
1910s : 0.5190
1920s : 1.3483
1930s : 1.2550
1940s : 0.4492
1950s : 0.3975
1960s : 1.1258
1970s : 0.7021
1980s : 0.7778
1990s : 1.2124
2000s : 1.4840
2010s : 2.2276