Question: When did Carey write the hit song "All I Want for Christmas is You?"
About the article "All I Want for Christmas Is You", section "Background and writing".

Candidate passages:
"All I Want for Christmas Is You" is a 1994 song by Mariah Carey.
All I Want for Christmas Is You may also refer to:  "All I Want for Christmas Is You" (Vince Vance & The Valiants song), a 1989 song by Vince Vance & The Valiants (lead vocal: Lisa Layne)  "All I Want for Christmas Is You", a 1966 song by Carla Thomas  "A Christmas Love Song" (music: Johnny Mandel and lyrics Alan Bergman and Marilyn Bergman) The first line of the lyric reads "All I Want for Christmas Is You", and recordings may be mislabeled with this as the "title".  
Merry Christmas II You is the second Christmas album by American singer-songwriter Mariah Carey.
The album was released on December 23, 2010, just before Christmas and features four original songs, covers and medleys of several traditional Christmas songs, and a re-recorded version of her 1994 Christmas hit "All I Want for Christmas Is You".
It was re-released on 14 January 2011 as Merry Christmas 2 U. 
On November 10, 2009, House of Heroes digitally released a three-song EP, for Christmas.
The EP includes a cover of the Mariah Carey hit, "All I Want For Christmas Is You," and the classic Christmas hymns, "Silent Night," and "O Come, O Come Emmanuel."
The EP has been given a very positive review from Absolutepunk.net 
"My Only Wish" received mixed reviews from music critics.
It has been compared to "All I Want for Christmas is You" by Mariah Carey.
Grace Cicciotti of iphone.funweek, commented, the two items in question, in fact, closely resemble, perhaps too much.
"My only wish", written by "The-Dream" has the same melody of "All I Want for Christmas is You ', the same high note and even the same meaning: not change much between all the phrase 'All I want for Christmas is you baby "and" My only wish for Christmas is you'.
In summary, it appears that much of Jessica suffers a lack of inspiration ... MTV said, we know that Mariah Carey has returned to the yuletide jam with her Merry Christmas II You.
And now we get some Christmas spirit from Jessica Simpson, with the jaunty, playful "My Only Wish."
Not unlike Mariah Carey's "All I Want for Christmas Is You", Simpson's track covers up some heartache with a buoyant and peppy track, complete with Salvation Army Christmas bells and fireside pianos.
GAWKER commented, "Is Jessica Simpson's New Christmas Song a Complete Mariah Carey Rip Off?".
Jessica Simpson debuted the first single from her upcoming Christmas album, called, "My Only Wish (For Christmas Is You)."
One problem: it's a total rip off of Mariah Carey's "All I Want For Christmas Is You."
All I Want for Christmas may refer to:  "All I Want for Christmas" (film), a 1991 film starring Lauren Bacall and Thora Birch  "All I Want for Christmas" (2007 film), a TV film featuring Robert Pine  "All I Want for Christmas" (song), a song by Shonen Knife  "All I Want for Christmas", a song by Joss Stone, written and produced by Dan Mackenzie  "All I Want For Christmas Is You", the first line of "A Christmas Love Song" (Mandel/Bergmans), and recordings of that song may be mislabeled.
Television episodes  "All I Want for Christmas" ("8 Simple Rules")  "All I Want for Christmas" ("Casualty")  "All I Want for Christmas" ("EastEnders")  "All I Want for Christmas" ("Everybody Loves Raymond")  "All I Want for Christmas" ("Fame")  "All I Want for Christmas" ("Happy Days")  "All I Want for Christmas" ("The Jeffersons")  "All I Want for Christmas" ("On Our Own")