As recently as 2006, almost no one in Seville got around by bicycle. The city's bike network was nearly non-existent. Today, Seville has an expansive bike network and is approaching 10 percent bicycle mode share.
Here's one way to understand the story of biking in Sevilla, Spain: It went from having about as much biking as Oklahoma City to having about as much biking as Portland, Oregon. It did this over the course of four years.