Although 54.0% of the population lived in urban areas in 2011, this percentage has been declining since 1996. Counties with over ⅔ urban population are Hunedoara County, Brașov County and Constanța County, while with less than a third are Dâmbovița County (30.06%) and Giurgiu County  and Teleorman County. Bucharest is the capital and the largest city in Romania, with a population of over 1.8 million in 2011. Its larger urban zone has a population of almost 2.2 million, which are planned to be included into a Bucharest metropolitan area up to 20 times the area of the city proper. Another 19 cities have a population of over 100,000, with Cluj-Napoca and Timișoara of slightly more than 300,000 inhabitants, Iași, Constanța, Craiova and Brașov with over 250,000 inhabitants, and Galați and Ploiești with over 200,000 inhabitants. Metropolitan areas in Romania have been constituted for most of these cities.
Question: How many years had the percentage of urban population been declining counting 2011?
Answer: 15