OK, I am being dumb...
Oh, wait... is it... first group of three numbers is MY 2007, second # (21,273) MY 2006, then a breakdown of 2007 calendar year production? The 2007, 2006, 2007 order threw me.
Backstage
Solstice 24,018
Sky 16,567 (includes total Sky to date of which 4430 was through 6/06)
Opel GT 2,365
MY 2006
Solstice 21,273
2007 Calendar year through end of June production
Solstice 13,425
Sky 6,834
GT 2,176