3
You need to specify a name attribute, or you would get unexpected behavior.
<apex:param name="aValue" value="" assignTo="{!variableFromVfp}"></apex:param>
1
The problem is with declaration of your Map variables. Any apex variable to be used in Visualforce page must be declared with {get;set;}.
So ideally it should be declared like this the way you've declared lastMonth in your class.:
public Map<String, Decimal> mapTargetCurrentMonth {get;set;}
public Map<String, Decimal> mapTargetLastMonth {get;...
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