Between 1961 and 1989, when Real dominated La Liga, only Atlético offered it any serious challenge, winning Liga titles in 1966, 1970, 1973 and 1977. In 1965, Atlético became the first team to beat Real at the Bernabéu in eight years. Real Madrids record against Atlético in more recent times is very favorable. A high point coming in the 2002–03 La Liga, when Real clinched the La Liga title after a 0–4 victory at Atlético at the Vicente Calderón Stadium. Atléticos first win over its city rivals since 1999 came with the Copa del Rey win in May 2013. In 2013–14, Real and Atlético were finalists of UEFA Champions League, the first final which hosted two clubs from same city. Real Madrid triumphed with 2014 UEFA Champions League Final in extra time. On 7 February 2015, Real suffered their first defeat in 14 years at the Vicente Calderón, a 4–0 loss. On 28 May 2016, Real and Atlético 2016 UEFA Champions League Final for the Champions League title in Milan, which resulted in a win for Real after a penalty shootout.
Question: In which year did Atlético win a Liga title four years after their first Liga title?
Answer: 1970