No 'heard'. 1992 Canada Ontario. 1995 US Southern Florida; Hong Kong. 1996 Malaysia; Canada New Brunswick Grand Manan. 1997 US Texas Rio Grande; Canada Sasketchewan Alberta and British Columbia. 1998 Singapore; Sichuan Wolong; US Pacific NW. 1999 US Arizona SE; North Carolina Coast. 2000 US California Central; China Yunnan Western. 2001 China Tsingtao; China Beidaihu; Shanghai Chong Min Island. 2002 Cuba Santiago de Cuba; Canada Alberta. 2003 Britain. 2004 US Texas South Padre Island and Rio Grande. 2006 US Colorado; Taiwan. 2007 Finland. 2008 Greece Lesvos; Spain. 2010 Morocco. 2012 Cuba Cayo Coco; China Hainan Island. 2013 China Jiangxi Wuyuan; Sichuan Central East. 2015 Sichuan North; Inner Mongolia Jilin; Shanxi; Yunnan SW. 2017 Guangxi Nongang.