By Gertrude Chavez-Dreyfuss NEW YORK, April 9 (Reuters) - U.S. Treasury yields rose on Friday after higher-than-expected producer prices data for March that showed inflation perked up, in line with other upbeat reports that suggested the world's largest economy was on a stable path to recovery from the pandemic. Friday's data, which showed U.S. producer prices increased more than expected in March, helped propel yields higher in the morning session. U.S. producer prices posted the largest annual gain in 9-1/2 years, fitting in with expectations for higher inflation as the economy reopens.