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More than 60,000 businesses have licensed UPS OnLine Tools since their introduction in April 1999 . These theaters played an important role in Russian cultural life , especially since their establishment in the 1700s initiated a very rich tradition of Russian classical ballet . Of all the exploits performed since their arrival in England by the extraordinary men with whom he had the honor to be associated , this seemed without question to be the most wonderful . In California , for instance , state-mandated appliance and building efficiency standards have saved over ten thousand gigawatt hours of electricity and a billion therms of natural gas since their introduction in 1977 ( California Energy Commission 1988 ) . The sentencing guidelines have evolved since their inception in 1987 and will continue to do so . The department 's Space Physics Group built much of the LECP instrument in the mid-1970 's , and since their launch in 1977 , Voyager 1 and its twin Voyager 2 have been setting endurance and distance records .