Table 3.

Eigenvalues, contribution ratio, and cumulative contribution ratio of principal components 1 to 4.

Primary Component	Eigen Value	Contribution Ration	Cumulative Contribution Ratio
1	2.711	67.77%	67.77%
2	0.941	23.53%	91.30%
3	0.317	7.92%	99.22%
4	0.031	0.78%	100.00%