Google Books Ngram Viewer

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

1950 - 1979 1980 - 1997 1998 1999 2000 ombuds English
1950 - 1971 1972 - 1981 1982 - 1983 1984 - 1997 1998 - 2000 ombudsman English
1950 - 1979 1980 - 1996 1997 1998 - 2000 2001 - 2000 ombudsperson English
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