Table 3: Year-wise mean efficiency of companies without (with) considering co-skewness and co-kurtosis.

YearWOSKWSK

20020.97940.9818
20030.97580.9775
20040.97150.9722
20050.96560.9666
20060.95750.9607
20070.94760.9539
20080.93550.9460
20090.92070.9368
20100.90280.9260
20110.88110.9135
Mean0.94380.9535