human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Rank, Railway Station, Annual entry/exit (millions) 2011–12, Annual interchanges (millions) 2011–12, Total Passengers (millions) 2011–12, Location, Main Services, Number of Platforms
###Question: How many annual interchanges in the millions occurred in 2011-12 when the number of annual entry/exits was 36.609 million? 
gpt
SELECT Annual interchanges (millions) 2011–12 FROM table WHERE Annual entry/exit (millions) 2011–12 = 36.609