Usage History of 'observations'

The following chart shows how frequently 'observations' appeared in printed materials over time. For example, the word 'observations' occurred 2 times in books in 1507 and 1,261,907 times in 2008. From 1507 to 2008, the word 'observations' was used a total of 43,290,364 times in books scanned by Google. See Reference: Google Ngram project.

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