Google Books Ngram Viewer

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

1960 - 1981 1982 - 1995 1996 1997 1998 - 2000 environmentally sound English
1960 - 1992 1993 - 1997 1998 1999 2000 environmentally friendly English
1960 - 1985 1986 - 1997 1998 1999 2000 environmentally responsible English
1960 - 1981 1982 - 1996 1997 1998 1999 - 2000 environmentally sensitive English
1960 - 1983 1984 - 1996 1997 1998 1999 - 2000 environmentally conscious English

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