Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_201_7 ( id number, "year" number, "gross domestic product" number, "us dollar exchange" text, "inflation index\n(2000=100)" number, "per capita income\n(as % of usa)" number )

### Question ###
what year did the kuwaiti dinar have the highest us dollar exchange ?

### Accurate SQL ###

SELECT "year" FROM table_201_7 ORDER BY "us dollar exchange" DESC LIMIT 1