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:
FC_Barcelona

Context:
The nickname culé for a Barcelona supporter is derived from the Catalan cul (English: arse), as the spectators at the first stadium, Camp de la Indústria, sat with their culs over the stand. In Spain, about 25% of the population is said to be Barça sympathisers, second behind Real Madrid, supported by 32% of the population. Throughout Europe, Barcelona is the favourite second-choice club. The club's membership figures have seen a significant increase from 100,000 in the 2003–04 season to 170,000 in September 2009, the sharp rise being attributed to the influence of Ronaldinho and then-president Joan Laporta's media strategy that focused on Spanish and English online media.

Question:
How much of the Spanish population are Barcelona supporters?

25%