How to view this year dynamic per months? (Comulative Total per months)

[gerasimovav]

Hello colleagues!

I often have to do similar task.

For example, we register incidents every day.

I can count incident by countrows measure, then put diagram: X axis is month and Y axis is amount of incident. 

For example, 5 in January, 3 in February, 2 in March...

There is no problem if I want to view amount of incident every months.

But if i want to view number of incident from the start of the year till the end of every month:

for example January - 5, February 8 (5+3), March 10 (5+3+2) - it is very difficult.

How can I plot this graph?