You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Economy_of_Greece

Context:
Greece has tended to lag behind its European Union partners in terms of Internet use, with the gap closing rapidly in recent years. The percentage of households with access to the Internet more than doubled between 2006 and 2013, from 23% to 56% respectively (compared with an EU average of 49% and 79%). At the same time, there has been a massive increase in the proportion of households with a broadband connection, from 4% in 2006 to 55% in 2013 (compared with an EU average of 30% and 76%). However, Greece also has the EU's third highest percentage of people who have never used the Internet: 36% in 2013, down from 65% in 2006 (compared with an EU average of 21% and 42%).

Question:
What has the been a massive increase in the number of households with in Greece?

a broadband connection