How do I know which invoices are not paid ? how do I calculate and understand that?

Black Stump Football Club STATEMENT Black Stump 30 April 2010 Qld 4512 Ref. No. XYZOZO \"W 1/01/10 Balance b/fwd 160.00 5/01/10 1493 8 Invoice 132.00 292.00 15/01/10 15029 Invoice 110.00 402.00 20/01/ 10 15389 Invoice 225.00 627.00 2/ 02/ 1 0 15789 Invoice 66.00 693 .00 1 5/ 02/ 1 0 Payment 160.00 533 .00 5/ 02/ 1 0 15992 Invoice 74.00 607.00 18/02/10 16119 Invoice 84.00 691.00 21/02/10 16303 Credit Note 242.00 449.00 27/02/10 16592 Invoice 5 2.00 501.00 3/ 03/ 1 0 Payment 210.00 291.00 9/ 03/ 1 0 16843 Invoice 34.00 325 .00 12/03/10 17002 Invoice 5 6.00 381.00