Table:
Fiscal Years

2019	2018	2017

Risk-free interest rate	2.8%	2.3%	1.9%

Expected term (years)	3.9	3.4	7.0

Expected volatility	51.9%	45.8%	32.3%

Target price	$53.87	$98.99	$67.39

Examine the table in this image and extract any merged cell areas. Please format the merged cell areas as JSON {'top-left':(X, Y), 'bottom-right':(Z, W)}, with (X, Y) indicating the (row_id, column_id) of the top-left cell and (Z, W) the bottom-right cell in the merged regions. Remember that the X, Y, Z, W all start from 1.

This table does not contain any merged cells.