The Legislative Council of the Hong Kong Special Administrative Region (LegCo) is the unicameral legislature of Hong Kong. It sits under China's "one country, two systems" constitutional arrangement, and is the power centre of Hong Kong's hybrid representative democracy, though popular representation in the legislature has diminished significantly in recent years, along with its political diversity. The functions of the Legislative Council are to enact, amend or repeal laws; examine and approve budgets, taxation and public expenditure; and raise questions on the work of the government. In addition, the Legislative Council also has the power to endorse the appointment and removal of the judges of the Court of Final Appeal and the Chief Judge of the High Court, as well as the power to impeach the Chief Executive of Hong Kong. Following the 2019–2020 Hong Kong protests, the National People's Congress disqualified several opposition councilors and initiated an electoral overhaul in 2021. The current Legislative Council consists of three groups of constituencies—geographical constituencies (GCs), functional constituencies (FCs), and Election Committee constituencies—and has been dominated by the pro-Beijing camp since an opposition walkout in 2020. The 2021 changes resulted in a drop in the share of directly elected representatives from 50% to 22% and an increase in the overall number of seats from 70 to 90, along with the establishment of a screening committee to vet candidates. The original two groups (GCs and FCs) had constitutional significance. Government bills requires a simple majority of the council for passage, whereas private member bills requires simple majorities in two discrete divisions of geographical members and functional members for passage. Therefore, the directly elected legislators (mainly from the GCs) had minimal influence over government policy and legislative agenda.[citation needed] The historical Legislative Council of Hong Kong in the British colonial era was created under the 1843 Charter as an advisory council to the Governor. The authority of the colonial legislature expanded throughout its history. A parallel Provisional Legislative Council was put in place by China from 1996 to 1998 to pass laws in anticipation of the Hong Kong handover.