41.   The number could double again this year, according to official Cuban tourism figures.

42.   The number doubles when visitors to private hospitals are included.

43.   The World Health Organization predicts that this number will double by the end of the century, with the number of women infected forming an increasingly significant proportion.

44.   Two years later the number has doubled.

45.   That number could double in two years as competitors slash the price of their dishes and offer cash-back purchases.