check out cded chart. <img src=http://host.businessweek.com/businessweek/GR-D-CDED-21-0-1-0-260-495-580-s_104_d_d_d_d_s_216_d_d_d_d_s_200_d_d_d_d_s_204_d_d_d_d_s_206_d_d_d_d_s_208_d_d_d_d_s_210_d_d_d_d_s_213_d_d_d_d_s_103_d_d_d_d_-1310A2D167378F770DFBE4452FF9568EF07C8C84.gif