What year did Universal Studios Hollywood open as a tourist attraction?

There are currently five Universal theme parks

• Universal StudiOS Hollywood in Universal City, CA has been open to the public (for guided tours) since the studio was founded in 1912. The modern incarnation of the tour began in 1964.
• Universal StudiOS Orlando in Orlando, FL - June 7, 1990
• Islands of Adventure in Orlando, FL - May 28, 1999
• Universal StudiOS Japan in Osaka, Japan - March 31, 2001
• Universal StudiOS Singapore in Sentosa Island, Singapore - April 19, 2007