Yields on the U.S. 10-year Treasury note declined sharply Wednesday after ISM service data showed signs of a weakening economy. The U.S. service sector expanded at slower pace than expected in January suggesting this key area of the economy may be slowing, according to the Institute for Supply Management. On the back of the disappointing data, the 10-year yield fell to a one-year low of 1.79 percent, causing the dollar to take a hit as well. If the 10-year rate continues to collapse, what's the best way to trade it? Using data from Kensho, a tool designed to quantify historical market events, CNBC Pro ran a study to find what happens when the 10-year yield declines significantly over a one-week period. If this drop in yields keeps going into next week, history shows the stock market does not do well and neither do certain sectors of the market. Read More Street explained: Mystery force moves market The analysis is based on the 10-year yield falling to 1.75 percent, a key technical level, in the next five days. This represents a 4 percent move lower, something that occurred 152 times over the past decade, according to Kensho. In a low-yield environment, the financial sector performed the worst, falling nearly 2 percent over a five-day period of declining 10-year yields. This trade may already be on the way, as the financial sector is the worst performer this year, down 13 percent. The S & P 500 lost 1.29 percent, on average, during that five-day period of falling yields. Within the financial sector, the stocks that sold off the most in the past were Lincoln National , Hartford Financial and American International Group , data from Kensho shows. Insurers take a hit from the lower returns they receive on the sizable investment of their so-called float in bonds, not to mention a decrease in rates they can charge customers. Disclosure: NBCUniversal, parent of CNBC, is a minority investor in Kensho.