No, it has gone up 4.75 times. You could say the price is now 5.75 times what it was a year ago, if you insist on using 5.75. (i haven't checked the maths, I'm just assuming the numbers are correct)
But back to the real issues.
So they're doing well in Aus with baby formula. Do we know how much of that is being sold for babies in Aus, and how much is being 'exported' for babies overseas? If the former, great. If the latter then I wonder how much is being bought for export as an A2 product and how much is being bought just because it is on the shelves? If the latter then it might not take much for it to lose it's popularity.