what is the best returning index fund from july 16 2013 to july 31 2013

CN had the highest return between July 16, 2013 and July 31, 2013 by a major index or ETF, returning 42.9%.

ASSET DATE % RETURN
CN
7/16/2013 - 7/31/2013
42.86%
NUGT
7/16/2013 - 7/31/2013
28.05%
YINN
7/16/2013 - 7/31/2013
14.41%
SVXY
7/16/2013 - 7/31/2013
11.61%
EWV
7/16/2013 - 7/31/2013
11.54%
EWP
7/16/2013 - 7/31/2013
10.26%
GREK
7/16/2013 - 7/31/2013
10.17%
GDX
7/16/2013 - 7/31/2013
10.12%
SLVP
7/16/2013 - 7/31/2013
10.1%
KOLD
7/16/2013 - 7/31/2013
9.75%
FAN
7/16/2013 - 7/31/2013
9.41%
RING
7/16/2013 - 7/31/2013
8.58%
SIL
7/16/2013 - 7/31/2013
8.53%
GOEX
7/16/2013 - 7/31/2013
8.17%
DRV
7/16/2013 - 7/31/2013
7.99%
PGJ
7/16/2013 - 7/31/2013
7.99%
EWI
7/16/2013 - 7/31/2013
7%
GDXJ
7/16/2013 - 7/31/2013
6.89%
SOCL
7/16/2013 - 7/31/2013
6.83%
CURE
7/16/2013 - 7/31/2013
5.93%
SRS
7/16/2013 - 7/31/2013
5.88%
UPV
7/16/2013 - 7/31/2013
5.81%
KORU
7/16/2013 - 7/31/2013
5.72%
UVXY
7/16/2013 - 7/31/2013
5.52%
FTAG
7/16/2013 - 7/31/2013
5.33%