what is the best returning index fund from jul 2015 to dec 2015

SCO had the highest return between July 1, 2015 and December 31, 2015 by a major index or ETF, returning 126.7%.

ASSET DATE % RETURN
SCO
7/1/2015 - 12/31/2015
126.7%
GBTC
7/1/2015 - 12/31/2015
109.92%
BZQ
7/1/2015 - 12/31/2015
91.55%
KOLD
7/1/2015 - 12/31/2015
84.25%
DRIP
7/1/2015 - 12/31/2015
78.65%
AMJ
7/1/2015 - 12/31/2015
71.47%
BSCO
7/1/2015 - 12/31/2015
69.77%
EMFM
7/1/2015 - 12/31/2015
69.73%
RNSC
7/1/2015 - 12/31/2015
69.2%
FM
7/1/2015 - 12/31/2015
69.2%
LSST
7/1/2015 - 12/31/2015
69.2%
IBMM
7/1/2015 - 12/31/2015
69.2%
KOIN
7/1/2015 - 12/31/2015
69.2%
HBTPF
7/1/2015 - 12/31/2015
64.87%
EDZ
7/1/2015 - 12/31/2015
48.16%
YANG
7/1/2015 - 12/31/2015
43.8%
ERY
7/1/2015 - 12/31/2015
41.05%
FXP
7/1/2015 - 12/31/2015
34.29%
EEV
7/1/2015 - 12/31/2015
33.03%
DUG
7/1/2015 - 12/31/2015
31.99%
DRN
7/1/2015 - 12/31/2015
24.36%
RETL
7/1/2015 - 12/31/2015
22.48%
SRTY
7/1/2015 - 12/31/2015
19.77%
YXI
7/1/2015 - 12/31/2015
19.19%
TZA
7/1/2015 - 12/31/2015
18.8%