You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Kenya

Context:
The current 8–4–4 system was launched in January 1985. It put more emphasis on vocational subjects on the assumption that the new structure would enable school drop-outs at all levels either to be self-employed or to secure employment in the informal sector. In January 2003, the Government of Kenya announced the introduction of free primary education. As a result, primary school enrolment increased by about 70%. Secondary and tertiary education enrolment has not increased proportionally because payment is still required for attendance. In 2007 the government issued a statement declaring that from 2008, secondary education would be heavily subsidiszed, with the government footing all tuition fees.

Question:
How much did enrollment increase?

increased by about 70%.