We asked half of them to predict for us how much their values would change in the next 10 years, and the others to tell us how much their values had changed in the last 10 years.
Pedimos a metade delas que previssem o quanto os valores delas  mudariam nos 10 anos seguintes, e às outras que nos dissessem o quanto os valores delas  tinham mudado nos 10 anos anteriores.