it is the longest existing smc that existed between 1959 and 2011, which is far behind than the former prime minister lee kuan yew from 1955 to 2015 where other people retired earlier, the last is ho kah leong which outlasted from 1966 to 1997. some of the constituencies were shifted to yew tee and keat hong respectively when choa chu kang was developed in the 1990s. a few of the constituencies has been interrupted due to the grc system, and most were removed and replaced by the younger constituencies due to the development.