US quarterly unemployment rate 1968-1982 - see Figure 7.2 of Time-Series Forecasting. 3.733 3.567 3.533 3.400 3.400 3.433 3.576 3.567 4.167 4.733 5.167 5.867 5.900 5.900 6.033 5.967 5.767 5.633 5.600 5.333 4.933 4.867 4.833 4.800 5.033 5.133 5.633 6.667 8.133 8.767 8.600 8.433 7.633 7.467 7.833 7.900 7.467 7.100 6.900 6.633 6.200 6.000 5.967 5.833 5.733 5.767 5.800 5.867 6.133 7.500 7.633 7.500 7.333 7.400 7.333 8.367 8.767 9.367 9.500 10.530