I want to know the answer to the following question:
According to a study in 1999, daylight savings has caused what approximate percentage of increase in leisure industry revenue in the European Union?
All the background I'm provided with is that "In 1984, Fortune magazine estimated that a seven-week extension of DST would yield an additional $30 million for 7-Eleven stores, and the National Golf Foundation estimated the extension would increase golf industry revenues $200 million to $300 million.". Is that enough to answer the question?