Large time series file : need to replace #N/A with previous value( value in row above

I have a large time series file.  I have 200,000+  " #N/A ".  I want to take the data point in the row cell directly above.  

so if it's na in  cell d23.  i want to take d22's value and copy it into the n/a cell for the entire spreadsheet.

is there an easy way to do this in vba?  i've no experience using vba.

inee leeAsked:
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In a new column in H2 for example

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and fill down then copy  and paste the values in the right col in Col D in the example


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inee leeAuthor Commented:
thanks.  one problem though is the case of consecutive N/As  which occurs alot in my file
Shouldn't be a problem see example
inee leeAuthor Commented:
got this.   thank you so much.
Solution according to author's comment
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