Table:
2019	2018

Number of Shares	Weighted Average Grant Date Fair Value	Number of Shares	Weighted Average Grant Date Fair Value

Non-vested at beginning of year	315,292	$2.26	438,712	$2.28

Shares granted	253,113	2.17	200,000	3.16

Shares vested	82,270	2.28	323,420	2.84

Non-vested at end of year	486,135	$2.53	315,292	$2.26

How many rows and columns does this table contain? The JSON format {"row_number": "m", "column_number": "n"} should be utilized to display the ultimate result.

There are 6 rows and 5 columns in the table. So, the final answer is {"row_number": "6", "column_number": "5"}.