With the four columns on the left down below, I want to be able to populate the fifth column (Year to Date Revenue):
Subscriber
Month
Year
Monthly Revenue
Year to Date Revenue
Apple
1
2020
$100
$100
Apple
2
2020
$300
$400
Apple
12
2020
$1,250
$1,250
Pepsi
1
2020
$200
$200
Pepsi...