rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
first second
number
number
number
number
number text(text) number number number number
1 china (chn) 71 39 35 145
how many nations earned at least ten bronze medals ?
WRB JJ NNS VBN IN JJS CD NN NNS .
9
select count ( c2 ) from w where c5_number >= 10