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Word: proof (lookup in dictionary) (lookup stats)
Dates: during 1990-1999
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Word Time Machine

Normalized population density for word "proof" throughout decades:

1870s : 1.4752
1880s : 1.0045
1890s : 0.6799
1900s : 0.5404
1910s : 0.9428
1920s : 1.1511
1930s : 1.1833
1940s : 1.1112
1950s : 1.1459
1960s : 0.9775
1970s : 0.9640
1980s : 0.8774
1990s : 0.9744
2000s : 0.9690
2010s : 0.8471