Many special coins have been produced, with imagery representing an event replacing the usual design on the reverse side of the coin. For some years, all the coins are replaced with a different design for that year. In other cases, only a few coins have the new design, which are released as special commemorative coins, although many usually end up in circulation. Because of their larger size, it is usually the 50c, 20c and $1 that have new designs; the $2, 10c and 5c are rarely changed. The commemorative coins include: