Following the initial issues of pataca banknotes in 1906, the new currency was supplemented the following year by 10 and 25 pataca notes, and in February 1920, 5, 10 and 50 avo notes were added. In 1923, the Banco Vui Hang introduced 10 pataca notes which stated that they were backed by Cantonese 20 cent coins. These notes were followed until 1934 by cashier's cheques issued by various banks in denominations of 1, 5, 10, 50, 100, 200, 400, 800 and 1000 dollars, presumably equivalent to the pataca. The BNU issues were augmented by 1 and 20 avo notes in 1942, and in 1944, 500 pataca notes were introduced. Also in 1944, further cashier's cheques were issued, denominated 1000 yuan and NC$5000. The 25 pataca note was discontinued after 1958. On August 8, 1988, BNU issued a 1000 pataca banknote, the highest value banknote yet. Because 8 in Chinese ("ba") is similar to "getting rich" ("fa"; ), this unique date, which occurs only once per century, gives the note a special meaning. Another feature is the replacement of the Coat of arms of Portugal with BNU's logo, shedding a political symbol in the prospect of reunification with China. In 1995, the Banco da China introduced notes in denominations of 10, 50, 100, 500 and 1000 patacas. Both the BNU and Banco da China introduced 20 pataca notes in 1996. Banknotes are currently issued in denominations of 10, 20, 50, 100, 500 and 1000 patacas. The current series of BNU banknotes was issued in 2005, while the Bank of China notes were last issued between 1995 and 2003. The dimensions of the banknotes are the same as that of Hong Kong banknotes worth the corresponding number of dollars. On December 20, 1999, the day Macau was retroceded to China, banknotes of all values (except for 10 patacas) by both banks were reissued with that date. On January 5, 2009, the Monetary Authority of Macau announced a new series of banknotes, dated 2008, released by the Bank of China. In 2008, the Macau branch of the Bank of China issued four million 20 pataca banknotes in commemoration of the 29th Summer Olympic Games in Beijing. In 2012, the Banco Nacional Ultramarino and Banco da China issued ten million 10 pataca banknotes to commemorate the Year of the Dragon, and from 2012–2023, the Banco National Ultramarino and the Banco da China are each authorized to issue a maximum number of 20 million special notes with the face value of 10 patacas to mark each lunar new year.