I need help setting targets on each month. Let's say starting on January 2019, our target is 100. On February, we increase it by 3 (100+3 = 103) so it becomes 103. We want to add 3 each month until December 2019. I can't seem to find the solution to this so what I am doing now is I added a formula column in the table (if else formula) to enter the target numbers manually to certain months and chose the maximum value in the threshold tab in the graph so it will show the targets I want each month. Is there a better way to do this? Next month, it's 2020 and I'm interested if someone else found a way around this.

What I'm doing right now: