The Federal Reserve's trade-weighted dollar index against a broad group of trading partners, as a change over twelve months. A sharply stronger dollar is a stress signal for emerging markets and commodity producers.
Threshold source: worldstat.us construction: a dollar rising more than 5 % in a year tightens conditions for dollar borrowers abroad. How thresholds are chosen
Direction matters more than level, and a strong dollar can reflect US strength rather than global stress.