In October 2013 the Spanish government made an amendment to the infamous “matriculation tax” which had prevented many
superyachts from registering to charter in Spain.
This change in legislation came about as a direct result of many years of lobbying by the various Spanish nautical Associations. The Associations collectively argued that more revenue could be brought into Spain from the yachting sector by eliminating this tax. Four years after the tax was modified this argument has been proven conclusively.

More information:
http://www.onboardonline.com/yachting-news/industry-news/aegy-report-reveals-astronomical-rise-of-chartering-in-the-balearics-/

AEGY Report Reveals Astronomical Rise of Chartering in the Balearics