Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Party | Name in English | City | Province | Date of registration |
| --- | --- | --- | --- | --- |
| Partido Obrero y Campesino | Workers and Peasants Party | Madrid | Madrid | 1979-01-02 |
| Lliga Liberal Catalana | Catalan Liberal League | Barcelona | Barcelona | 1979-01-05 |
| Partido del País Canario | Party of the Canarian Country | Las Palmas | Las Palmas | 1979-01-05 |
| Unión del Pueblo Navarro | Navarre People's Union | Pamplona | Navarre | 1979-01-05 |
| Independientes de Cataluña | Independents of Catalonia | Barcelona | Barcelona | 1979-01-10 |
| Unión para la Libertad de Expresión | Union for the Freedom of Expression | Madrid | Madrid | 1979-01-10 |
| Partido Social-Cristiano de Asturias | Social-Christian Party of Asturias | Oviedo | Asturias | 1979-01-11 |
| Bloc Català de Treballadors | Catalan Workers Bloc | Barcelona | Barcelona | 1979-01-13 |
| Unión Socialista Obrera Canaria | Canarian Workers Socialist Union | Santa Cruz de Tenerife | Santa Cruz de Tenerife | 1979-01-13 |
| Organización de Profesionales de España | Organization of Professionals of Spain | Madrid | Madrid | 1979-01-16 |
| Falange Española Auténtica | Authentic Spanish Falange | Madrid | Madrid | 1979-01-17 |
| Partido Regionalista de Cantabria | Regionalist Party of Cantabria | Santander | Cantabria | 1979-01-18 |
| Conceyu Nacionalista Astur | Asturian Nationalist Council | Mieres | Asturias | 1979-01-19 |
| Partido Comunista de Canarias | Communist Party of the Canaries | Las Palmas | Las Palmas | 1979-01-26 |
| Pueblo Canario Unido | United Canarian People | Las Palmas | Las Palmas | 1979-01-26 |
| Partido Social Democráta | Social Democratic Party | Madrid | Madrid | 1979-04-19 |
| Partido de El Bierzo | El Bierzo Party | Ponferrada | León | 1979-04-23 |
| Joventut Republicana de Lleida | Republican Youth of Lleida | Lleida | Lleida | 1979-04-27 |
| Partido Socialista del Pueblo Extremeño | Socialist Party of the Extremadurian People | Badajoz | Badajoz | 1979-05-04 |
| Izquierda Democrática de Extremadura | Democratic Left of Extremadura | Badajoz | Badajoz | 1979-05-11 |
| Confederación Rural Española | Spanish Rural Confederation | Madrid | Madrid | 1979-06-07 |
| Centro Andaluz - Partido de Andalucía | Andalusian Centre - Party of Andalusia | Seville | Seville | 1979-07-12 |
| Juventudes Nacional Revolucionarias | Revolutionary National Youth | Madrid | Madrid | 1979-07-17 |
| Partido de la Revolución Canaria | Party of the Canarian Revolution | Las Palmas | Las Palmas | 1979-07-17 |
| Partit Liberal del País Valencià | Liberal Party of the Valencian Country | Torrent | Valencia | 1979-07-17 |
| Unión Castellano-Manchega | Castilan-Manchean Union | Madrid | Madrid | 1979-07-19 |
| Partido Radical | Radical Party | Madrid | Madrid | 1979-07-20 |
| Frente para la Unidad Falangista | Front for Falangist Unity | Madrid | Madrid | 1979-07-23 |
| Partido de los Trabajadores de España | Workers Party of Spain | Madrid | Madrid | 1979-07-24 |
| Asociación de Ciudadanos de la Mayoría Silenciosa | Citizens Association of the Silent Majority | Granada | Granada | 1979-07-30 |
| Partido Socialista de Asturias | Socialist Party of Asturias | Oviedo | Asturias | 1979-07-30 |
| Centristas de Catalunya | Centrists of Catalonia | Barcelona | Barcelona | 1979-12-20 |
Question:
When was the Partido radical party in Madrid registered?
Answer:
1979-07-20