e="" class="an ">&ensp;</span>increase <span  title="" class="an ">&ensp;</span>mean <span  title="" class="an ">&ensp;</span>closed <span  title="" class="an ">&ensp;</span>times <span  title="" class="an ">&ensp;</span>that <span  title="" class="an ">&ensp;</span>showed <span  title="" class="an ">&ensp;</span>a <span  title="" class="an ">&ensp;</span>marked <span  title="" class="an ">&ensp;</span>voltage <span  title="" class="an ">&ensp;</span>dependent <span  title="" class="an ">&ensp;</span>decrea