US.失业率(1958-2002) 11 。00 8765432 1955196019651970197519801985199019952000 Unemployment rate- Natural rate of unemploymentU.S. 失业率（ 1958-2002） 2 3 4 5 6 7 8 9 10 11 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 Percent of labor force Unemployment rate Natural rate of unemployment 1