主成分\年份 | 2000 | 2005 | 2010 | 2015 | 2020 | 2005 |
PC1 | 85.04% | 79.78% | 89.21% | 82.60% | 83.82% |
|
PC2 | 8.81% | 12.08% | 5.75% | 10.67% | 10.01% |
|
PC3 | 4.93% | 6.93% | 2.05% | 5.66% | 4.92% |
|
PC4 | 1.22% | 1.21% | 1.08% | 0.63% | 1.25% |
|