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Word: vertebrates (lookup in dictionary) (lookup stats)
Dates: during 1920-1929
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Word Time Machine

Normalized population density for word "vertebrates" throughout decades:

1880s : 0.3871
1890s : 2.0820
1900s : 4.6291
1910s : 3.4400
1920s : 2.5534
1930s : 1.9346
1940s : 1.3027
1950s : 0.4649
1960s : 1.0046
1970s : 0.3932
1980s : 0.6105
1990s : 1.0984
2000s : 0.2650