I'll probably break this down a LITTLE more soon, but here's something to tide you over. Again, this accounts for all characters currently in our database.

Barbarian
Circle 1 to 29 - 93.42%
Circle 30 to 59 - 5.40%
Circle Over 60 - 1.18%

Bard
Circle 1 to 29 - 90.83%
Circle 30 to 59 - 7.75%
Circle Over 60 - 1.42%

Cleric
Circle 1 to 29 - 88.91%
Circle 30 to 59 - 9.74%
Circle Over 60 - 1.35%

Empath
Circle 1 to 29 - 93.64%
Circle 30 to 59 - 6.00%
Circle Over 60 - 0.36%

Moon Mage
Circle 1 to 29 - 86.25%
Circle 30 to 59 - 12.18%
Circle Over 60 - 1.56%

Paladin
Circle 1 to 29 - 88.37%
Circle 30 to 59 - 9.44%
Circle Over 60 - 2.19%

Ranger
Circle 1 to 29 - 88.67%
Circle 30 to 59 - 10.20%
Circle Over 60 - 1.13%

Thief
Circle 1 to 29 - 91.38%
Circle 30 to 59 - 7.40%
Circle Over 60 - 1.21%

Trader
Circle 1 to 29 - 93.60%
Circle 30 to 59 - 4.78%
Circle Over 60 - 1.62%

W Mage
Circle 1 to 29 - 88.09%
Circle 30 to 59 - 10.58%
Circle Over 60 - 1.33%