Table 4.

Weight coefficient and contribution rate of main ingredients.

		X 1	X 2	X 3	X 4	X 5	X 6	Eigenvalue	r c (%)	r T (%)
2011	f 1	−0.961	−0.997	0.962	−0.670	0.977	0.953	5.152	85.862	85.862
2012	f 1	−0.690	−0.997	0.792	−0.070	0.573	0.886	3.215	53.582	53.582
	f 2	−0.720	−0.051	0.596	−0.997	0.820	0.402	2.703	45.054	98.636
2013	f 1	0.096	−0.912	0.369	0.916	0.932	0.555	2.995	49.911	49.911
	f 2	−0.910	−0.054	0.899	0.172	0.283	0.801	2.389	39.820	89.731