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The class took the temperature at lunchtime for 20 days:$$\begin{aligned}& 19^\circ \text{C}, 18^\circ \text{C}, 19^\circ \text{C}, 20^\circ \text{C}, 19^\circ \text{C}, 20^\circ \text{C}, 20^\circ \text{C}, 20^\circ \text{C}, \\& 19^\circ \text{C}, 18^\circ \text{C}, 20^\circ \text{C}, 19^\circ \text{C}, 20^\circ \text{C}, 19^\circ \text{C}, 18^\circ \text{C}, 20^\circ \text{C}, \\& 18^\circ \text{C}, 17^\circ \text{C}, 19^\circ \text{C}, 20^\circ \text{C}\end{aligned}$$Complete the table to show how many times each temperature happened:
Temperature (\(^\circ \text{C}\)) Frequency
17
18
19
20