what is the best returning index fund from april 2015 to june 2015

DRV had the highest return between April 1, 2015 and June 30, 2015 by a major index or ETF, returning 33.8%.

ASSET DATE % RETURN
DRV
4/1/2015 - 6/30/2015
33.75%
TTT
4/1/2015 - 6/30/2015
31.37%
TMV
4/1/2015 - 6/30/2015
30.47%
UCO
4/1/2015 - 6/30/2015
30.45%
LABU
4/1/2015 - 6/30/2015
23.63%
TBT
4/1/2015 - 6/30/2015
20.64%
SRS
4/1/2015 - 6/30/2015
19.26%
ECNS
4/1/2015 - 6/30/2015
19.02%
KWEB
4/1/2015 - 6/30/2015
18.41%
SBIO
4/1/2015 - 6/30/2015
18.04%
UGA
4/1/2015 - 6/30/2015
17.04%
USO
4/1/2015 - 6/30/2015
16.94%
SVXY
4/1/2015 - 6/30/2015
16.57%
BIB
4/1/2015 - 6/30/2015
14.47%
ASHS
4/1/2015 - 6/30/2015
14.27%
DRIP
4/1/2015 - 6/30/2015
14.05%
XBI
4/1/2015 - 6/30/2015
13.9%
BBP
4/1/2015 - 6/30/2015
13.74%
HACK
4/1/2015 - 6/30/2015
12.84%
PGJ
4/1/2015 - 6/30/2015
12.73%
CN
4/1/2015 - 6/30/2015
12.5%
WEAT
4/1/2015 - 6/30/2015
12.17%
UAE
4/1/2015 - 6/30/2015
11.67%
KBWR
4/1/2015 - 6/30/2015
11.46%
BBC
4/1/2015 - 6/30/2015
11.45%