Unique drop rate

I'm level 72 now, and I've never dropped neither a unique or legendary object. Which is the drop rate of unique items? 0,0001%?

to increase the chances of drop in a normal phase is recommended to keep an eye LUCK attribute the higher more chance to win a legendary item in a normal phase also advise spending the odd stages (eg 9-1, 9- 3, 9-5, 9-7, 9-9, 10-1, 10-3, 10-5, 10-7, 10-9) a chance to drop a rare item, epic or legendary is higher in odd phases , need not necessarily be the stages 9 and 10 can be any stage 1,2,3,4,5,6,7,8,9 and 10, but as you already know the tier of items changes according to the stage , so the bigger the stage the tier ... good game