Figure 23 shows the graph of the consumer price index for the years 1983 (t = 0) through 2002 (t = 19). This index measures how much a basket of commodities that costs $100 in the beginning of 1983 would cost at any given time. In what year was the rate of increase of the index greatest? The least?

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Consumer price index (dollars) 190 175 160 145 130 115 100 0 (1983) 4 8 12 Time (years) Figure 23 Consumer price index. 16 19 (2002)