Shares in California-based online streaming site Netflix jumped by 19% on Tuesday on news that it had added more subscribers than expected during the third quarter. It was the largest one-day share-price gain in more than three years. Netflix prides itself on streaming original content and is behind the hit shows including House of Cards, Making a Murderer, and Narcos, the story of Colombian drug baron Pablo Escobar. The company says it will be releasing 1,000 hours of original content in 2017, compared with 600 hours this year. Netflix has around 87 million subscribers worldwide.