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:
Kenya has proven deposits of oil in Turkana and the commercial viability was just discovered. Tullow Oil estimates Kenya's oil reserves to be around 10 billion barrels. Exploration is still continuing to determine if there are more reserves. Kenya currently imports all crude petroleum requirements. Kenya, east Africa's largest economy, has no strategic reserves and relies solely on oil marketers' 21-day oil reserves required under industry regulations. Petroleum accounts for 20% to 25% of the national import bill.

Question:
How much does petroleum account for of the national import bill?

r 20% to 25%