Yes, but it is not a direct subtraction.
The close of BIL on 3/28 was 91.80. Then a dividend was paid on 4/1 of .4047, so all the previous data has to be adjusted by a factor.
Here's how the factor is calculated.
C = close day before dividend is paid
D = dividend paid the next day
factor = (C - D) / C
This makes the factor .99559, so the close of 3/28 gets adjusted to 91.80 * .99559 = 91.395. And all other closes get adjusted also.
This matches Stock Charts numbers. If you want to see the unadjusted numbers I sure you know you can put in "_BIL".
I don't got back and adjust all the other prior months because all the numbers would just factored by the same number, so the ratio would not change.
Trade the Charts and not the Heart - Expect the trend to
continue until it doesn't - Realtime is the real deal