what is the best returning index fund from jul 2017 to dec 2017

GBTC had the highest return between July 1, 2017 and December 31, 2017 by a major index or ETF, returning 416.8%.

ASSET DATE % RETURN
GBTC
7/1/2017 - 12/31/2017
416.78%
KOIN
7/1/2017 - 12/31/2017
138.67%
IBMM
7/1/2017 - 12/31/2017
138.67%
EMFM
7/1/2017 - 12/31/2017
138.67%
LSST
7/1/2017 - 12/31/2017
138.67%
HMLSF
7/1/2017 - 12/31/2017
133.85%
NAIL
7/1/2017 - 12/31/2017
103.4%
REMX
7/1/2017 - 12/31/2017
76.48%
SOXL
7/1/2017 - 12/31/2017
66.34%
DFEN
7/1/2017 - 12/31/2017
65.85%
SVXY
7/1/2017 - 12/31/2017
56.64%
UCO
7/1/2017 - 12/31/2017
55.85%
UDOW
7/1/2017 - 12/31/2017
55.13%
TECL
7/1/2017 - 12/31/2017
53.47%
YINN
7/1/2017 - 12/31/2017
52.71%
BRZU
7/1/2017 - 12/31/2017
51.66%
USD
7/1/2017 - 12/31/2017
50.93%
EDC
7/1/2017 - 12/31/2017
45.61%
GUSH
7/1/2017 - 12/31/2017
42.15%
CWEB
7/1/2017 - 12/31/2017
41.6%
TQQQ
7/1/2017 - 12/31/2017
39.56%
BNO
7/1/2017 - 12/31/2017
38.49%
ERX
7/1/2017 - 12/31/2017
38.47%
KORU
7/1/2017 - 12/31/2017
38.1%
LIT
7/1/2017 - 12/31/2017
37.56%