做的一个作业看看有啥问题希望指出，下一步该怎么改进

Dependent Variable: Y
Method: Least Squares
Date: 03/22/20   Time: 18:14
Sample: 2005 2018
Included observations:  14
Variable	Coefficient	Std. Error	t-Statistic	Prob.
C	-5215.787	6771.885	-0.770212	0.4590
X1	0.983452	0.215537	4.562810	0.0010
X2	-1.122036	0.660048	-1.699931	0.1200
X3	66.31097	64.59128	1.026624	0.3288
R-squared	0.994845	Mean dependent var		14156.00
Adjusted R-squared	0.993298	S.D. dependent var		5060.042
S.E. of regression	414.2292	Akaike info criterion		15.12567
Sum squared resid	1715859.	Schwarz criterion		15.30826
Log likelihood	-101.8797	Hannan-Quinn criter.		15.10877
F-statistic	643.2861	Durbin-Watson stat		0.893883
Prob(F-statistic)	0.000000

y人均消费支出、x1人均可支配收入,x2人均基本养老保险金支出、x3城市居民消费价格指数、