Scrutinize the data and tweets to envisage if the closing price of $ngg will swell or contract at 2015-07-21. Please affirm either Rise or Fall.
Context: date,open,high,low,close,adj-close,inc-5,inc-10,inc-15,inc-20,inc-25,inc-30
2015-07-07,-1.0,0.3,-1.5,0.4,0.4,-0.3,1.4,2.4,2.4,2.6,3.2
2015-07-08,0.0,0.3,-0.4,-0.5,-0.5,0.3,1.5,2.7,2.8,2.8,3.6
2015-07-09,1.4,1.5,0.0,0.3,0.3,0.1,0.8,2.1,2.4,2.3,3.0
2015-07-10,-0.0,0.4,-0.2,2.6,2.6,-2.1,-1.9,-0.7,-0.2,-0.3,0.3
2015-07-13,0.3,0.7,-0.3,-0.6,-0.6,-1.1,-1.5,-0.3,0.4,0.3,0.7
2015-07-14,-0.2,0.1,-0.5,0.8,0.8,-1.4,-2.1,-1.2,-0.5,-0.5,-0.3
2015-07-15,-0.1,0.3,-0.2,0.7,0.7,-1.3,-2.4,-2.0,-1.2,-1.1,-1.1
2015-07-16,-0.4,0.0,-0.5,0.8,0.8,-1.3,-2.7,-2.7,-2.0,-1.8,-1.9
2015-07-17,-0.2,0.3,-0.4,-0.8,-0.8,-0.2,-1.6,-1.9,-1.3,-0.9,-1.0
2015-07-20,0.4,0.4,-0.1,0.0,0.0,0.0,-1.3,-2.0,-1.3,-0.9,-1.0


Answer: