Stevia Powder.

I have been using Sweet Leaf Stevia Powder (debittered) for 15 yrs Plus. All of a sudden now, the powder is not the same colour and one, needs to use 3 x times the volume, to attain the proximate previous sweetness. Clearly the distributors are now adding fillers or so. Price has remained the same but we now have have to buy 3-times to amount!!! Un-acceptable *******.