Studies have a wide range for men and women across different cultures. But, using high estimates for both sexes you get less than 50% globally.
~25% to 60% of married people in the US cheet, but only 80% get married. Global data similar, but a significant number never get married which keeps things under 50%.
And how did you arrive at this number?
> The number of possible Alcoholics don't add up to 75% of the global population.
True, but the impact is still significant: alcoholism is among the top causes of death, at least in the US.