Table 1. Descriptive statistics.

Variables	Number	Average	Standard	Minimal	Maximum
GVCPos	10260	1.356	0.327	0.000	4.425
ROD	10260	0.828	1.404	0.000	11.71
THE	10260	1.462	0.214	1.063	1.731
PSE	10260	7.823	2.061	4.691	13.59
EPR	10260	4.018	0.120	3.664	4.328
PGDP	10260	9.941	0.975	6.719	11.42
TAF	10260	0.506	0.674	0.000	2.519
REX	10260	4.586	0.117	4.008	4.928
IEF	10260	2.129	0.0830	1.828	2.274
EMP	10260	4.166	1.648	0.693	7.128
EXP	10260	8.145	1.542	5.678	10.79
IMP	10260	7.608	0.766	6.600	9.807