题目选项分析

From 1973 to 1976, total United States consumption of cigarettes increased 3.4 percent, and total sales of chewing tobacco rose 18.0 percent. During the same period, total United States population increased 5.0 percent.

If the statements above are true, which of the following conclusions can be properly drawn?

【选项】The proportion of nonsmokers in the United States population dropped slightly between 1973 and 1976.