Table:
Callsign

Area served

Frequency

Band

Fate

Freq currently

Purpose

7CAE

Hobart

092.1

FM

Changed call to 7THE ca. 1980

7THE

Community

7DY

Derby

AM

Moved to Scottsdale and changed call to 7SD in 1954

7SD

Commercial

7EX

Launceston

1008

AM

Moved to FM in 2008 as 7EXX

silent

Commercial

7HO

Hobart

0864

AM

Moved to FM in 1990 as 7HHO

7RPH

Commercial

7HT

Hobart

1080

AM

Moved to FM in 1998 as 7XXX

7TAB (HPON)

Commercial

7LA

Launceston

1098

AM

Moved to FM in 2008 as 7LAA

silent

Commercial

7NT

Launceston

0711

AM

Moved to FM in 2006, retained call

silent

National

7QN

Queenstown

0630

AM

Moved to FM in 1991, retained call

7RN

National

7QT

Queenstown

0837

AM

Changed call to 7XS in 1988

7XS

Commercial

7UV

Ulverstone

AM

Moved to Devonport and changed call to 7AD in 1940

7AD

Commercial

7ZL

Hobart

0603

AM

Changed call to 7RN in 1991

7RN

National

Please ascertain the quantity of rows and columns within the provided table. Return the result as JSON in the format {"row_number": "m", "column_number": "n"}, e.g., {"row_number": "12", "column_number": "7"}.

There are 12 rows and 7 columns in the table. So, the final answer is {"row_number": "12", "column_number": "7"}.