this period. The PAP, which has remained in power since independence, is believed to rule in an authoritarian manner by some activists and opposition politicians who see the strict regulation of political and media activities by the government as an infringement on political rights. In response, Singapore has seen several significant political changes, such as the introduction of the Non-Constituency members of parliament in 1984 to allow up to three losing candidates from opposition parties to be appointed as MPs. Group Representation Constituencies (GRCs) were introduced in 1988 to create multi-seat electoral divisions, intended to ensure minority representation in parliament. Nominated members of parliament were introduced in 1990 to allow non-elected non-partisan MPs. The Constitution was amended in 1991 to provide for an Elected President who has veto power in the use of Past Reserves and appointments to certain public offices. In 1990, Goh Chok Tong succeeded Lee and became Singapore's second prime minister. During Goh's tenure, the country went through the 1997 Asian financial crisis and the 2003 SARS outbreak. In 2004, Lee Hsien Loong, the eldest son of Lee Kuan Yew, became the country's third prime minister. Lee Hsien Loong's tenure included the 2008 global financial crisis, the resolution of a dispute over land ownership at Tanjong Pagar railway station between Singapore and Malaysia, and the introduction of the 2 integrated resorts (IRs), located at the Marina Bay Sands and Resorts World Sentosa. The People's Action Party (PAP) suffered its worst ever electoral results in 2011, winning just 60% of votes, amidst debate over issues including the influx of foreign workers and the high cost of living. On 23 March 2015, Lee Kuan Yew died, and a one-week period of public mourning was observed nationwide. Subsequently, the PAP regained its dominance in Parliament through the September general election, receiving 69.9% of the popular vote, although this remained lower than the 2001 tally of 75.3% and the 1968 tally of 86.7%. The 2020 election held in July saw the PAP drop to 61% of the vote, while the opposition Workers' Party took 10 of the 93 seats, the highest number ever won by an opposition party. Government and politics Singapore is a parliamentary republic based on the Westminster system. The Constitution of Singapore is the supreme law of the country, establishing the structure and responsibility of governance. The President is head of state and exercises many executive powers on