Passage: China is the worlds leading producer of electric bicycles. According to the data of the China Bicycle Association, a government-chartered industry group, in 2004 Chinas manufacturers sold 7.5 million electric bicycles nationwide, which was almost twice 2003 sales; domestic sales reached 10 million in 2005, and 16 to 18 million in 2006. By 2007, electric bicycles were thought to make up 10 to 20 percent of all two-wheeled vehicles on the streets of many major cities. A typical unit requires 8 hours to charge the battery, which provides the range of 25–30 miles (40–50 km), at the speed of around , however people usually illegal override, makes it just like normal motorcycles, capable of reach nearly . A large number of such vehicles is exported from China as well (3 million units, worth 40 billion yuan ($5.8 billion), in 2006 alone),.
How many electric bicycles were exported from China in 2006? How many more electric bicycles were sold in 2005 than in 2004? In 2006, how much did electric bicycles exports contribute to the Chinese economy? Which years saw electric bicycle sales of 10 million or more?