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:
Republic_of_the_Congo

Context:
Public expenditure health was at 8.9% of the GDP in 2004, whereas private expenditure was at 1.3%. As of 2012, the HIV/AIDS prevalence was at 2.8% among 15- to 49-year-olds. Health expenditure was at US$30 per capita in 2004. A large proportion of the population is undernourished, with malnutrition being a problem in Congo-Brazzaville. There were 20 physicians per 100,000 persons in the early 2000s (decade).

Question:
How much of the gross domestic product was spent on public health in 2004?

8.9%