every now and then data releases change in their effect on markets
i remember a time i think 2004 and before nobody cared about something called non-farm payrolls since it had no effect on the markets
until one friday all the pairs moved for at least 150 pips and more
from that time this piece of data became no. 1 in the markets
my view is all data releases are important but you have to make a huge study to know for sure which is a currency mover and which is a stocks mover