For the Past 25 Years, the Ratio of Physicians to the Population

For the past 25 years, the ratio of physicians to the population they serve has

A) declined steadily as doctors give up their practices.
B) increased in hospital settings but declined for the doctor with his or her own office.
C) increased steadily.
D) declined steadily as doctors chose to practice abroad.
E) been fairly stable; whereas some areas of specialty have many more doctors per capita, others have many fewer across the board.