COPENHAGEN - Maersk Line, the world’s largest container shipping company and a part of the A.P. Moller-Maersk group, sees its capacity market share slipping to around 14 percent in 2017 from 15.9 percent now, according to presentations. Between now and 2016, the company says it expects to keep up with market growth and retierated it would spend about $3 bilion a year until 2020 in new vessel orders as well as new containers and on maintainance, according to a presentation that will be given to investors on Wednesday.