* Population growth: Some regions where Spanish is spoken have higher birth rates than others.
* Migration patterns: People move to areas where Spanish is spoken, or areas where it is not.
* Language policy: Governments can influence the spread of Spanish through education and other means.
* Globalization and technology: The internet and other technologies can make it easier for people to learn Spanish.
However, some projections suggest that Spanish could become the second most spoken language in the world by 2050. This would mean that a significant percentage of the world's population would be Spanish speakers.
It's important to note that these are just predictions, and the actual percentage could be higher or lower.