Maelezo ya Chini

b Kulingana na utafiti mbalimbali, baadhi ya nchi hizo ni: Albania, Australia, Austria, Azerbaijan, China, Denmark, Hispania, Hong Kong, Ireland, Israel, Jamhuri ya Cheki, Japani, Kanada, Korea Kusini, Norway, Sweden, Ufaransa, Uholanzi, Uingereza, Ujerumani, Uswisi, na Vietnam.