Google Books Ngram Viewer

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

1918 - 1952 1953 - 1998 1999 - 2002 2003 - 2005 2006 - 2008 putzfrau German
1918 - 1944 1945 - 1994 1995 - 1999 2000 - 2003 2004 - 2008 putzfrauen German
1918 - 1967 1968 - 1971 1972 - 1974 1975 - 2003 2004 - 2008 raumpflegerin German
1918 - 1965 1966 - 1976 1977 - 1978 1979 - 2000 2001 - 2008 raumpflegerinnen German

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