in a paper I have read that Croatian pupils in the secondary school learns on average two languages (on "normal" gymnasians (=~ high school) 2, in science-oriented 1 and in linguistic schools, 3). (See p. 5 at the buttom, warning, it's German: https://www.ffzg.unizg.hr/german/cms/media/casopisZGB/ZGB15HaueslerKaracic.pdf)
But m. E. the the chart on p. 8 upstairs is contrary to this fact. I think, the language English should be nearly at 100 % and maybe German also. Towards this chart (narly) nobody learns 2 languages on the Gymnasium Suppose that 75 % of the pupils go to normal Gymnsiums, still two languages should be each nearly at 75 %.
Thanks for your help beforehand, and sry for my bad English..!