history of interest rates
- U.S. Prime Rate Mode (Most Frequent Value; 1947 - Present): 7.5%. The Median U.S. Prime Interest Rate (1947 - Present): 8.75%. U.S. Prime Rate All-Time High: 21.50% (Dec 19, 1980 thru Jan 2, 1981 - click here). CLICK HERE to Jump to The Top of This Page. Mortgage Rates | LIBOR Charts | LIBOR News | SITEMAP. Chart: U.S. Prime Rate vs. Fed Funds Target Rate vs. 1-Month LIBOR vs. 3-Month LIBOR.