Probably as quickly as 2000-2006 when the park saw three rollercoasters, Tidal Wave and 7 flats added. Lets not jump the gun here, old day Thorpe had a lot of main-land to play with and many attractions which had seen better days. Modern day Thorpe is a park of technology, where the average ride age is very young. It will be a while before Thorpe throw coaster after coaster at the park again.