Word count problem

Hi there
I would like to know my novel word count but the problem I have is that every time I check Statistics the word count is not accurate. Please see the attachments. It said 30.000 words but I if you see behind the window you will see my whole project .
There is a folder named PASADO which has 50.854 words.
There is a folder named PRESENTE which has 14.395 words.
It makes around 65.000 words. Statics only works when I select all the scenes one by one, then I have the accurate number.
Is there a way to look in a glimpse the word count for my whole project? By the way I went to Options of Statitcs and tried many options without success.