While playing around with old economic data in your spare time, you find that in 1963 the unemployment rate was 5.7 percent and the inflation rate was 1.6 percent; in 1972, the unemployment rate was 5.6 percent and the inflation rate was 3.4 percent; in 1979, unemployment was 5.8 percent and inflation was 13.3 percent; in 1988, unemployment was 5.5 percent and inflation was 4.4 percent; in 1996, unemployment was 5.4 percent and inflation was 3.3 percent. Does this evidence necessarily imply anything about the shape of the SRIA curve? How might you interpret these data?