Re: is the meaning of " in turn" similar to respectively in these sentences ?
No, "in turn" does not work here.
Originally Posted by duiter
Also, "the number of visitors was twice as many as those" is not natural. I have changed it to "the number of visitors to Portugal was twice the number ..."
Also, note that after "visit" as a verb, we do not use "to" in this construction. (I visited Greece, he visited Portugal, they visited the beach.)
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.