INTEGRYS ENERGY GROUP INC

CUSIP: 45822P105 Class: COM

STATE OF MICHIGAN RETIREMENT SYSTEM's Holding History (CIK: 0000762152)

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

Q1 2015
Shares 136,899 Value ($000) $9,859 Avg Close — Range —
Q4 2014
Shares 152,099 Value ($000) $11,841 Avg Close — Range —
Q3 2014
Shares 151,999 Value ($000) $9,853 Avg Close — Range —
Q2 2014
Shares 166,799 Value ($000) $11,864 Avg Close — Range —
Q1 2014
Shares 166,799 Value ($000) $9,950 Avg Close — Range —
Q4 2013
Shares 166,599 Value ($000) $9,065 Avg Close — Range —
Q3 2013
Shares 166,599 Value ($000) $9,311 Avg Close — Range —
Q2 2013
Shares 166,299 Value ($000) $9,733 Avg Close — Range —