According to a report in The Japan Times:
‘The kanji for kin, meaning gold or money, has been picked as the character best symbolizing this year’s social mood in Japan, a Kyoto-based kanji promotion organization said Monday.’
‘The selection was based on votes cast by the general public. Among the 153,562 entries received this year, kin ranked first with 6,655 entries, according to the Japan Kanji Aptitude Testing Foundation.’
The word and character appears in the Japanese names for many varieties of Nishikigoi of course, for example Kin Gin Rin (金銀鱗), Kin Showa (金昭和), Kin Ki Utsuri(金黄写り), Kin Matsuba (金松葉) and Kin Kikokuryu (金輝黒竜).
Incidentally, it also appears in the word for Friday, Kinyoubi (金曜日), and for anyone that works Monday to Friday then Kinyoubi is always a golden day of the week.