Find the values of x for which the function is continuous. 
Definitions:
Imports
Imports refer to the goods and services that are brought into a country from abroad for sale.
Balance Of Trade Surplus
Occurs when a country's exports exceed its imports during a given time period, indicating a positive balance of trade.
Swiss Francs
The currency of Switzerland, used as a medium of exchange within the country.
Appreciated
A rise in the value of an asset or currency.
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