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Political party strength in Puerto Rico

The political party strength in Puerto Rico has been held by different political parties in the history of Puerto Rico. Today, that strength is primarily held by two parties, namely:

The New Progressive Party (PNP in Spanish) which holds about 39% of the popular vote while advocating for Puerto Rico to become a state of the United States
The Popular Democratic Party (PPD in Spanish) which holds about 34% of the popular vote while advocating for maintaining the current political status of Puerto Rico as that of a Commonwealth,

The rest of the strength is held by three minority parties

The Movimiento Victoria Ciudadana (MVC) which holds about 12% of the popular vote while advocating for a constitutional assembly and running on a progressive platform.
The Puerto Rican Independence Party (PIP in Spanish) which holds about 6% of the popular vote while advocating for the independence of Puerto Rico
The Project Dignity (PD) which holds about 6% of the popular vote while advocating for a Christian and conservative platform.

Before the 1952 Constitution

The following table indicates the party of elected officials in the United States insular area of Puerto Rico after 1898:

Governor

The table also indicates the historical party composition in the territorial or Commonwealth:

Senate
House of Representatives
Territory delegation to the U.S. House of Representatives

The Puerto Rican parties are as follows:

Acción Cristiana (AC), Alianza Puertorriqueña (AP), Coalición* (C), Estadista (E), Estadista Puertorriqueño (EP), Estadista Republicano (ER), Puerto Rican Independence (PIP), Liberal (L), Movimiento Unión Soberanista (MUS), Nonpartisan (NP), New Progressive Party (PNP), Popular Democratic Party (PPD), People's Party (P), Working People's Party (PT/PPT), Puertorriqueños por Puerto Rico (PPR), Republicano Puertorriqueño (RP), Socialista Obrero (SO), Socialist (PSP), Unionist (U), and Unión Republicana Progresista (URP).
*Coalición was an electoral coalition, not a party.

For a particular year, the noted partisan composition is that which either took office during that year or which maintained the office throughout the entire year. Only changes made outside of regularly scheduled elections are noted as affecting the partisan composition during a particular year. Shading is determined by the final result of any mid-cycle changes in partisan affiliation.