Last year was the first 2 shut-out year since 1985, and 1975 before that. Dodd's era was, of course, built on defense with 2 shutouts each year in 1962, 1963, 1964 and 1966.
In 1961 we shut out Rice (ranked) Duke, Tulane and UF. In 1956, five goose eggs Tulane Duke, Alabama, Florida, and the Mutts. From 1955 to 1957 we had an amazing 13 shutouts in those 32 games. The 1955 year not only did we shutout LSU, FSU, Duke and Pitt in the bowl game, we held Bama to 2 points and Georgia to 3 points. Five points in six games. For the three seasons 55 to 57 we gave up an average of 5.1 points a game. Can you imagine being the opposing team and knowing you probably would not score a touchdown against us whenever we played? All sorts of rules changes since then makes this only ancient history, but it was somewhat of an accomplishment to have two shutouts last year after almost 30 years.