With the advent of high-tech Bowling balls and forgiving lane oil patterns, tens of thousands of perfect 300 games are bowled every year. While a good number of them are bowled by people who have already done so at least once, there are still several thousand first-time 300s bowled each year.
In fact, as of April 2010, 15 people have officially bowled a 900 series -- which is three 300 games back-to-back in the same league or tournament session. (The actual number of 900s bowled is over 20, but only 15 have been recognized by the USBC.)
Fun fact: in duckpin and candlepin bowling, two variations of the sport, no 300s have ever been rolled.
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While the USBC (United States Bowling Congress) doesn't keep track of the number of 300s bowled back to back, we know that at least 15 people have been credited with a sanctioned 900 series since 1997 -- a feat that requires three 300s to be bowled back-to-back-to-back. (Make that 16 if you include Glenn Allison's not sanctioned, but widely recognized, 900 shot way back in 1982.)
As an informed guess, I'd say that these days several dozen back-to-back 300s are bowled each year; mostly by people who already have several solo 300s under their belt. Ironically, Tom Jordan's record-setting 1198 for four games, achieved in 1989, was NOT one of them: he went 300-299-300-299.
It depends on the organization tracking the information. USBC would have tracking of sanctioned 300 games bowling bowled during sanctioned league or tournament play. CTF would have for Canadian Tenpin Federation. TNBA would have for their association. Etc.