The U.S. Mint oversees money production and maintains a list of presidential dollars and the year they are released on the agency's website. As of 2015, the Mint does not publicize the exact dates of release each year but does indicate they are released in order in which presidents served.
Presidential coins began in 2007 with the first four presidents. The Mint continues to issue four new $1 coins each year. The coins are gold and feature an image of the president they represent and the words "In God We Trust" on the obverse. All the coins in the series include a common reverse with a portrayal of the Statue of Liberty on them.