Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1940 - 1946 1947 - 1956 1957 1958 - 1966 1967 - 1968 yogurt English
1940 - 1947 1948 - 1958 1959 1960 - 1968 1969 - 1970 yoghourt English
1940 - 1949 1950 - 1967 1968 1969 1970 yoghurt English

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