$$\begin{align}&\left(\frac{du}{dt}\approx0\right)_{\text{Jul,2014}}&&,\text{$u=<$no.of up votes$>$}\\&\left(\frac{dd}{dt}\gg0\right)_{\text{Jul,2014}}&&,\text{$d=<$no.of down votes$>$}\end{align}$$ Simply Why?
P.S. Humour intended.
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10$\begingroup$ There is one confounding factor that might or might not be responsible for a large part of that increase. Posts with downvotes are much more likely to be deleted than posts without them, and SEDE doesn't contain information about deleted posts. $\endgroup$ – user9733 Sep 2 '14 at 11:29
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5$\begingroup$ I think it would be good to include a link to the source of the graph. (Is it from some SEDE query?) $\endgroup$ – Martin Sleziak Sep 2 '14 at 11:51
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1$\begingroup$ It appears the graph comes from this SEDE query, which counts the number of votes (up and down) cast each month on questions that are less than 31 days old at the time of the vote. $\endgroup$ – user642796 Sep 2 '14 at 18:06
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3$\begingroup$ For comparison, same data for Stack Overflow (with discussion). $\endgroup$ – user147263 Sep 3 '14 at 6:05
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6$\begingroup$ Maybe it is easier to downvote,and then go on to downvote the next question, than to answer. $\endgroup$ – André Nicolas Sep 4 '14 at 5:49
