what is the best returning index fund from august 1 2013 to august 15 2013

AGQ had the highest return between August 1, 2013 and August 15, 2013 by a major index or ETF, returning 33.9%.

ASSET DATE % RETURN
AGQ
8/1/2013 - 8/15/2013
33.9%
NUGT
8/1/2013 - 8/15/2013
32.23%
GDXJ
8/1/2013 - 8/15/2013
21.75%
CN
8/1/2013 - 8/15/2013
20%
GOEX
8/1/2013 - 8/15/2013
19.16%
SIL
8/1/2013 - 8/15/2013
18.86%
SILJ
8/1/2013 - 8/15/2013
18.26%
DRV
8/1/2013 - 8/15/2013
16.38%
SLV
8/1/2013 - 8/15/2013
16.03%
SIVR
8/1/2013 - 8/15/2013
15.97%
SLVP
8/1/2013 - 8/15/2013
13.07%
GDX
8/1/2013 - 8/15/2013
12.29%
SRS
8/1/2013 - 8/15/2013
11.2%
BIS
8/1/2013 - 8/15/2013
10.18%
SSG
8/1/2013 - 8/15/2013
9.69%
SDOW
8/1/2013 - 8/15/2013
9.61%
EPU
8/1/2013 - 8/15/2013
9.54%
RING
8/1/2013 - 8/15/2013
9.54%
CHIM
8/1/2013 - 8/15/2013
9.34%
XPP
8/1/2013 - 8/15/2013
9.12%
FTRI
8/1/2013 - 8/15/2013
9.04%
ARGT
8/1/2013 - 8/15/2013
8.99%
COPX
8/1/2013 - 8/15/2013
8.99%
SDP
8/1/2013 - 8/15/2013
8.9%
FAZ
8/1/2013 - 8/15/2013
8.51%