指标 | 1980 | 1984 | 1988 | 1992 | 1996 | 2000 | 2004 |
I(%) | 50.02 | 41.14 | 44.48 | 45.49 | 47.16 | 49.69 | 56.32 |
U(%) | 9.47 | 12.26 | 16.32 | 28.2 | 34.94 | 36.25 | 43.5 |
I/U | 5.28 | 3.35 | 2.72 | 1.61 | 1.35 | 1.37 | 1.29 |