Count the degrowing value(negative value) by month

Hi Experts,

      i want a formula for Count the degrowing value(negative value) by month.

so i used running Sum for both LY YTD Value and CY YTD Value,then i calculate growth %.

so i need a formula where i calculate all negative % and that to 04.2014 to till now.

Count should not consider 2013 values..

please help ;its urgent.

Thanks.

Ashwini