1997 to 2009
The 1997 version has this information:
© 1978, 1979, 1981, 1985, 1986, 1988, 1992, 1995, 1997
by The Church of Jesus Christ of Latter-day Saints.
The 2009 version has this information:
© 1978, 1979, 1981, 1985, 1986, 1988, 1992, 1995, 1997, 2009 by Intellectual Reserve, Inc.
Key observation:
The LDS Church gives you the impression that very few changes have occurred in its teachings over the last 31 years. Personally, I have never seen the versions between 1979 and 1995 nor have I been able to find them on the Internet. But I do have the 1978 and 1997 versions.
By removing the reference to the 1997 version, the casual investigator would never be lead to look for the version that is still available to do a side by side comparison. It seems like a historical writing is trying to be erased. As one examines all the chapters, one can easily surmise why the LDS Church has done so.