Which bond funds had the biggest inflows over 3 years?

Many of these products, according to Bankrate senior analyst Greg McBride, have benefited from investors aiming to shed risk and navigate choppy markets. "While U.S. Treasurys are free from default risk, they are susceptible to interest rate risk - when rates rise, prices fall", McBride says. McBride added that a highly anticipated short-term rate cut by the Fed would ultimately "generate less interest income over time as newer, lower-yielding bonds come into the funds, and older, higher-yielding bonds mature, or are refinanced". [Extracted from the article]