FC Barcelona:

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.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What did the club membership grow to by 2009?
170,000