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United States 2021 In force National
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People's Republic of China 2018 Ended National
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People's Republic of China 2015 Ended National
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People's Republic of China 2014 In force National
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Denmark 2013 Achieved National
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People's Republic of China 2012 In force National
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United States 2009 In force National
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United States 2008 In force National
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United States 1999 Ended National
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United States 1978 Ended National