Graph these case-sensitive comma-separated phrases: between and from the corpus American English British English Chinese (simplified) English English Fiction English One Million French German Hebrew Russian Spanish with smoothing of 0 1 2 3 4 5 6 7 8 9 10 20 30 40 50 .
Search in Google Books: 1920 - 1939 1940 - 1968 1969 - 1974 1975 - 2001 2002 - 2008 have a discussion (English) 1920 - 1938 1939 - 1999 2000 - 2002 2003 - 2005 2006 - 2008 have a conversation (English)