user: Question: How many countries has a gdp (nominal) of $29.9 billion?
Columns: ['Country', 'Population', 'Area (km²)', 'GDP (nominal)', 'GDP per capita (nominal)']
Types: ['text', 'real', 'real', 'text', 'text']
Sample row: ['Kazakhstan', 16967000.0, 2724900.0, '$196.4 billion', '$11,772']
SQL:

assistant: SELECT COUNT("GDP per capita (nominal)") FROM "Table" WHERE "GDP (nominal)" = '$29.9 billion';