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Eigenvalues and contribution rate of principal components in 2016∼2018.
| Principal components | 2016 | 2017 | 2018 | |||
| Eigenvalues | Cumulative contribution rate (%) | Eigenvalues | Cumulative contribution rate (%) | Eigenvalues | Cumulative contribution rate (%) | |
| PC1 | 5.148 | 27.094 | 3.994 | 21.020 | 3.738 | 19.676 |
| PC2 | 2.353 | 39.476 | 2.807 | 35.794 | 3.127 | 36.132 |
| PC3 | 2.137 | 50.722 | 2.297 | 47.884 | 2.699 | 50.336 |
| PC4 | 1.631 | 59.307 | 1.793 | 57.322 | 1.593 | 58.721 |
| PC5 | 1.181 | 65.524 | 1.191 | 63.593 | 1.362 | 65.889 |
