looks like someone beat me to it!
technically the numbers are for the whole of WDW but bcause of how they are worked out they are most accurate for MK.
If your worried if you picked the right day to go to specific parks, you want to use the "best park/worst park" info, see below:
Date Lvl Best Worst
------ --- ------ -------
Wed, 28 Apr '10 5 EP DS AK
Thu, 29 Apr '10 7 AK MK EP
Fri, 30 Apr '10 4 MK EP DS GRAD NIGHT
Sat, 01 May '10 4 EP DS GRAD NIGHT
Sun, 02 May '10 6 AK MK EP
Mon, 03 May '10 7 MK AK
Tue, 04 May '10 4 DS AK EP
Wed, 05 May '10 4 EP MK DS AK CINCO DE MAYO
Thu, 06 May '10 6 DS AK MK EP
Fri, 07 May '10 4 MK DS EP
Sat, 08 May '10 6 EP DS
Sun, 09 May '10 4 EP MK DS AK MOTHER'S DAY
if the number is 5 or less I find that best/worst doesn't really matter too much.
Hope that's helpful.