WISCONSIN ENERGY CORP

CUSIP: 976657106 Class: COM

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

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

Q1 2015
Shares 87,004 Value ($000) $4,307 Avg Close — Range —
Q4 2014
Shares 92,904 Value ($000) $4,900 Avg Close — Range —
Q3 2014
Shares 92,404 Value ($000) $3,973 Avg Close — Range —
Q2 2014
Shares 92,404 Value ($000) $4,336 Avg Close — Range —
Q1 2014
Shares 92,204 Value ($000) $4,292 Avg Close — Range —
Q4 2013
Shares 92,104 Value ($000) $3,808 Avg Close — Range —
Q3 2013
Shares 92,604 Value ($000) $3,739 Avg Close — Range —
Q2 2013
Shares 92,904 Value ($000) $3,808 Avg Close — Range —