El Clasico is arguably the biggest game in club football each year, but just how does it rate against other big matches? How do Barcelona and Real Madrid compare with each other, as well as with other clubs? When El Clasico is on, the world really is watching. The most recent Barcelona-Real Madrid clash, in April 2016, aired in more than 90 countries around the world. When it comes to supporters inside the stadium, El Clasico is unparalleled. Last season, more than 30,000 more fans attended Barcelona’s games with Real Madrid than any other game between major football rivals. The first meeting, at Madrid’s Bernabeu had an attendance of 81,044 while the second, at Barcelona’s Camp Nou, drew a crowd of 99,264.
http://www.espnfc.com/spanish-primera-division/15/blog/post/3008322