Table 6. The contribution rate and eigenvalues of each principal component

Principal component	Eigenvalues	Variance contribution rate (%)	Cumulative contribution rate (%)
1	2.582	51.632	51.632
2	1.479	29.589	81.221
3	0.529	10.584	91.805
4	0.303	6.064	97.869
5	0.107	2.131	100.000