Since 1950, the annual inflation rate in the U.S. Part 2 A. has cycled regularly between being positive and negative, peaking around 1980. B. has always been positive, but it has also varied substantially, peaking around 1980, and falling to its lowest level in 2009 due to the effects of the Great Recession. C. has typically been positive, but it has also varied substantially, peaking around 1980, and becoming negative for several months in early 2009 due to the effects of the Great Recession. D. first became positive around 1980, but became negative for several months in early 2009 due to the effects of the Great Recession