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Apex Trigger Help to calculate Previous yr Balance Amt+CurrentAmt



I have Custom Object Annual Charge__C.


Field Name: Previous Balance Amt_c.


Annual charges created based on Year For Example :AC-2011,AC-2012,AC-2013,AC-2014,AC--2015.


for each year balance amount will be displayed in  a field name  :BalanceAmt__c.


My Requirement:This Trigger should fire on after insert /after update of Annual charge Object

For Example If, I INSERT A RECORD  AC-2011 Balance  Amount  = 700

Then in Previous Balance Amt_c=700 should display (This is calculated as Previous yr Balance+ Current yr of the selected record (i.e)


In this Example there is no Annual Charge  Before 2011 there is no record ,so Previous Balance will be 0 + SELECTED YR is 2011 (Balance Amt of 2011 is 700)



Same will be Continued as,


if,Balance Amt =700

Previous Balance Amt = 700



if,Balance Amt =1000

Previous Balance Amt =( Previous  yr amt 2011+2012 yr Balance Amt )=700+1000=1700











Kindly help me with this.


Thanks in Advance:)