用eviews做了VAR，进而脉冲响应函数和方差分解，但方差分解的贡献值非常小，为什么会出现这种结果呢？

Variance Decomposition of RP:
Period	S.E.	RP	RJM	RFU	RLNG
1	0.061017	100	0	0	0
2	0.063858	99.505	0.393818	0.097187	0.003997
3	0.0639	99.37614	0.443677	0.098837	0.081346
4	0.063929	99.37446	0.443667	0.099159	0.082709
5	0.063932	99.37347	0.444576	0.099244	0.082707
6	0.063932	99.37339	0.444611	0.099245	0.08275
7	0.063932	99.37339	0.444612	0.099245	0.082751
8	0.063932	99.37339	0.444613	0.099245	0.082751
9	0.063932	99.37339	0.444613	0.099245	0.082751
10	0.063932	99.37339	0.444613	0.099245	0.082751