> The figures will likely strengthen concern among economists already
> worried about how Japan's domestic-driven recovery will fare once the
> nation's sales tax is raised to 8% from 5% in April.

I parse the sentence like this:

> The figures / will likely strengthen / concern / among economists/ (who/ are)
> already / worried/ about (how /Japan's domestic-driven recovery /will
> fare / once / the nation's sales tax / is raised / to 8% from 5% / in
> April). Economists / expect / at least a temporary chill / in demand
> (when / the new rate / goes into effect.) 

I wonder whether the way I parse the sentence is right.