How to populate null values as blank in cell

Hi All,
I have an query i have data like blow
qtr
data
1Q-4Q 2009
4,069,379
1Q-4Q 2010
3,979,490
and i want result like below
1Q-4Q 2009
4,069,379
% Change
-2%
1Q-4Q 2010
3,979,490
for % age change i have applied the previous function
formula is (data/previous(data)) -1*100
but is coming like below
% Change
0%
1Q-4Q 2009
4,069,379
% Change
-2%
1Q-4Q 2010
3,979,490
for the 1 column i am getting 0% age due to i applied previous function but i don't have data for 2008
so i am trying not to populate 0% for the % change before 2009
I have checked with null value
If (IsNull(Previous [data])) then "" else ([data]/previous[data]) -1*100
so it is populating blanck value but i can not formatting the values as %age
please suggest
how can i solve this issue please advice
Thanks in advance
Ranjeet

Change your formula to be:
=If(IsNull(Previous([data])=0 then ([data]/previous([data])-1 * 100
You can ignore the else part and it will leave the null cell as blank and you can still use your number format.

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