The West Bretton park also won the Art Fund Prize for Museum of the Year - the largest arts prize in the UK - and reopened a chapel as a new gallery after a £500,000 revamp.
Peter Murray, YSP’s founding and executive director, said: “We are delighted with these latest numbers - they are a wonderful recognition of the commitment and hard work over many years of everyone connected with YSP and confirmation that what we have at YSP is a rare and unparalleled experience for our visitors.”
Gary Verity, chief executive at tourism agency Welcome to Yorkshire, said: “The team at YSP have worked tirelessly for years to create a visitor attraction that not only wows people, but regularly changes – which in turn encourages people to visit again.
“The number of visitors they’re now seeing combined with the world-class talent which exhibit there shows that they’re a major player on the world stage. It’s also a reflection of the strong position Yorkshire tourism now sees itself in – a global destination.