Tourism has now become the park's major industry, with about 12 million visitors each year, mainly from the UK's larger settlements, China, Japan, Spain, Germany and the US. Windermere Lake Steamers are Cumbria's most popular charging tourist attraction with about 1.35 million paying customers each year, and the local economy is dependent upon tourists. The negative impact of tourism has been seen, however. Soil erosion, caused by walking, is now a significant problem, with millions of pounds being spent to protect overused paths. In 2006, two tourist information centres in the National Park were closed.