MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS's Holding History (CIK: 0001083190)

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

Q3 2015
Shares 1,010,604 Value ($000) $43,365 Avg Close — Range —
Q2 2015
Shares 606,210 Value ($000) $34,178 Avg Close — Range —
Q1 2015
Shares 615,190 Value ($000) $40,664 Avg Close — Range —
Q4 2014
Shares 596,276 Value ($000) $40,064 Avg Close — Range —
Q3 2014
Shares 646,766 Value ($000) $49,685 Avg Close — Range —
Q2 2014
Shares 813,484 Value ($000) $58,229 Avg Close — Range —
Q1 2014
Shares 1,018,207 Value ($000) $66,509 Avg Close — Range —
Q4 2013
Shares 1,025,063 Value ($000) $67,787 Avg Close — Range —
Q3 2013
Shares 820,553 Value ($000) $59,269 Avg Close — Range —
Q2 2013
Shares 689,060 Value ($000) $46,064 Avg Close — Range —