Table:
2019	2018	2017

Net income attributable to American Tower Corporation stockholders	$1,887.8	$1,236.4	$1,238.9

Dividends on preferred stock	—	(9.4)	(87.4)

Net income attributable to American Tower Corporation common stockholders	$1,887.8	$1,227.0	$1,151.5

Basic weighted average common shares outstanding	442,319	439,606	428,181

Dilutive securities	3,201	3,354	3,507

Diluted weighted average common shares outstanding	445,520	442,960	431,688

Basic net income attributable to American Tower Corporation common stockholders per common share	$4.27	$2.79	$2.69

Diluted net income attributable to American Tower Corporation common stockholders per common share	$4.24	$2.77	$2.67

Could you count the number of rows and columns in this table? Present the final answer in a JSON format {"row_number": "m", "column_number": "n"} such as {"row_number": "2", "column_number": "3"}.

This table has 9 rows and 4 columns. Thus, the final answer is {"row_number": "9", "column_number": "4"}.