CREATE TABLE table_4299 ("Year" FLOAT, "GDP at constant prices  ( THB trillions ) " TEXT, "GDP at constant prices growth rate  ( percent change ) " TEXT, "GDP at current prices  ( USD billions ) " TEXT, "Export volume of goods and services  ( percent change ) " TEXT, "Current account balance  ( percent of GDP ) " TEXT)

How many current account balances are associated with GDP at constant prices growth rates of 4.6?
SELECT COUNT("Current account balance (percent of GDP)") FROM table_4299 WHERE "GDP at constant prices growth rate (percent change)" = '4.6'
SELECT COUNT("Current account balance (percent of GDP)") FROM "table_4299" WHERE "GDP at constant prices growth rate (percent change)" = '4.6'