Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_3555 ( "Year" real, "Timeslot" text, "Network" text, "Episodes" real, "Viewers (in millions/overall)" text, "Viewers (in millions/target group 14-49)" text, "Market share (overall)" text, "Market share (target group 14-49)" text )

### Question ###
How many times was the viewer target group 0.63?

### Accurate SQL ###

SELECT COUNT("Market share (target group 14-49)") FROM table_3555 WHERE "Viewers (in millions/target group 14-49)" = '0.63'