WESTAMERICA BANCORPORATION

Ticker: WABC CUSIP: 957090103 Class: Common Stock

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

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

Q2 2014

Shares 12,430 Value ($000) $650 Avg Close $35.20 Range $33.12 - $38.02

Q1 2014

Shares 12,430 Value ($000) $672 Avg Close $35.67 Range $33.22 - $38.53

Q4 2013

Shares 12,430 Value ($000) $702 Avg Close $36.29 Range $32.69 - $39.26

Q3 2013

Shares 12,430 Value ($000) $618 Avg Close $32.64 Range $30.72 - $34.37

Q2 2013

Shares 12,430 Value ($000) $568 Avg Close $29.77 Range $27.86 - $31.27

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2014	12,430	$650	$35.20	$33.12 - $38.02
Q1 2014	12,430	$672	$35.67	$33.22 - $38.53
Q4 2013	12,430	$702	$36.29	$32.69 - $39.26
Q3 2013	12,430	$618	$32.64	$30.72 - $34.37
Q2 2013	12,430	$568	$29.77	$27.86 - $31.27