In the provided graph we can see that the year in which the U.S dollar was worth the most of the other country's currency was in 2020. This is because the bottom of the graph indicates the year while the left side of the graph indicates the amount of the other country's currency that is equal to a single U.S dollar. Therefore, if we match the dots in this graph to the values we can see that the highest dot is in 2020 where a single U.S Dollar was worth 15 of the other country's national currency. The other years had the following values...
- 1990: 5 currency
- 2000: 10 currency
- 2010: 2.5 currency
- 2020: 15 currency
In conclusion, the country in question had its highest exchange rate with the U.S dollar in 2020 for a total of 15 currency per U.S Dollar
Here is a related link regarding currency exchange
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