Upper and lower control limits

I have the following column data displayed as a line chart. What exactly do I have to do to make the chart show as a "Process behavior Chart" that includes an upper and lower control limit line?


Week Average Count
Week 19 93.39% 15
Week 20 95.95% 17
Week 21 86.37% 30
Week 22 89.91% 30
Week 23 95.75% 32
Week 24 93.68% 34
Week 25 95.16% 38
Week 26 95.04% 34
Week 27 96.14% 36