By 1984, however, pandas were no longer given as gifts. Instead, China began to offer pandas to other nations only on 10-year loans, under terms including a fee of up to US$1,000,000 per year and a provision that any cubs born during the loan are the property of China. Since 1998, because of a WWF lawsuit, the United States Fish and Wildlife Service only allows a US zoo to import a panda if the zoo can ensure that China will channel more than half of its loan fee into conservation efforts for the giant panda and its habitat.