Between 1914 and the end of 1923 the Papiermark's rate of exchange against the U.S. dollar plummeted from 4.2 mark/dollar to 4.2 trillion mark/dollar. The price of one gold mark (0.35842g gold weight) in German paper currency at the end of 1918 was two paper mark, but by the end of 1919 a gold mark cost 10 paper mark. This inflation worsened between 1920 and 1922, and the cost of a gold mark (or conversely the devaluation of the paper mark) rose from 15 to 1,282 paper mark. In 1923 the value of the paper mark had its worst decline. By July, the cost of a gold mark had risen to 101,112 paper mark, and in September was already at 13 million. On 30 Nov 1923 it cost 1 trillion paper mark to buy a single gold mark.