While a precise percentage is elusive, it's safe to say the number is significantly lower than 100% and likely considerably lower than many developed nations. Many factors contribute to this, including:
* Financial constraints: College tuition in the Philippines can be a significant barrier for many families.
* Accessibility: Not all areas have equal access to higher education institutions.
* Other life circumstances: Many students may need to enter the workforce immediately after high school to support their families.
To find potentially relevant data, you would need to explore reports from the Philippine Statistics Authority (PSA), the Commission on Higher Education (CHED), and possibly other relevant government agencies. Even then, the data may not directly answer the question of graduation percentage but offer related metrics like college enrollment rates or completion rates.