how many g&t kids scored at 99?

Insideschools has the answer.

In 2009 a grand total of 1000 children scored in the 99th percentile on the citywide assessments for kindergarten gifted and talented programs.

The "99s" account for 56% of the 1788 students who qualified for citywide G&T programs by scoring at or above the 97th percentile on the tests...

An unofficial report puts this year's 99th percentile number about 300 above last year's total. The NY Times looks at the equity of the test and debating the approaches to testing, and numbers of children scoring in the 99th percentile by district.