Refer to the figure below to answer the following questions. 
Figure 7.3.1
The figure shows the market for shirts in Canada,where D is the domestic demand curve and S is the domestic supply curve.The world price is $20 per shirt.Canada imposes a tariff on imported shirts of $4 per shirt.
-Refer to Figure 7.3.1.With the tariff,Canada imports ________ million shirts per year.
Definitions:
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