NORTHWEST NAT GAS CO

CUSIP: 667655104 Class: COM

STRS OHIO's Holding History (CIK: 0000820478)

Note: Option positions (PUT/CALL) are excluded.

Q1 2017

Shares 6,600 Value ($000) $390 Avg Close — Range —

Q4 2016

Shares 17,400 Value ($000) $1,040 Avg Close — Range —

Q3 2016

Shares 17,400 Value ($000) $1,045 Avg Close — Range —

Q2 2016

Shares 18,000 Value ($000) $1,166 Avg Close — Range —

Q1 2016

Shares 18,600 Value ($000) $1,001 Avg Close — Range —

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2017	6,600	$390	—	—
Q4 2016	17,400	$1,040	—	—
Q3 2016	17,400	$1,045	—	—
Q2 2016	18,000	$1,166	—	—
Q1 2016	18,600	$1,001	—	—