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5 <br /> �tt�chment 3 <br /> Hi��c�ric I�ate �tru�turc <br /> 4'�'h�:n tl�e ���tem ���as first�stal�tis���c�, th� r�t�s ����r� desi�n�c� sc� that ti�� tr��t��:�° �ai� �5�- <br /> cu�t�r��er:; ���er��tnc��ih���� et�c3�a�1� ic�pa�Y fc�r t}xe c��c:r�t�c�r� t�f the �}'st�r��. t)��c:r€ir���, as <br /> cca�ts ro�� anc� th� rate �ta�'�c3 thL��ne, th�: �a�rc€:r�t��;� c�i"i�e ���ratin� cc�at��ai�i b� tk��; <br /> cu:�tozz�er k�e�amc I�s� ar�d I��s, whil�: th�; ��;rc�rtt��� �aic� l��° the C;c�unc}' �z��w��c�re an� <br /> tn��r�. Thz� is �}�c�wn in �i�ure 1 b�1��Y. <br /> Conc�ptual Perc��tage C+�nf�ibution c�f Gtrang�: C�unty € <br /> ' and Cust�m�rs tc� Ser�rer C?perating Cc�sts s��ce 1989 <br /> 12t}°l� ; �...�.�, <br /> , <br /> � �C}C}°l� _ ; <br /> ». � <br /> � $0°ln �_..--,-,..-,,..- � <br /> ..�....d v�,.�,�,_,, <br /> : , � <br /> ._ ; � <br /> � , <br /> a �D°� �.w��...m�-- .�'"' � ��: € ; � C�s�c�rr�er cantr�butic�n � <br /> � ` -������_ .�Courst� G�ntrib�rtic�n � <br /> � 4Q�1� �,,...�..`� �_���" ,�� � ���._w,.�� _ _ _._.. __ <br /> � 2Q°l� �.:. ��W,,,» � <br /> �� <br /> .,��" .: � <br /> C}% «�"'' <br /> ; <br /> ��qa°� ��c�`l.F ���j� ��c�<b Q�� ��b� ��`� �,�CC1 �,�� <br /> � `L � �L `l� <br /> ���� 'Y'e�r ' <br /> ____.� __. �__ _�-__ ..._.. .. __�_....�.e <br /> Fi�?ure 1 <br /> �.s�%c�u cattt se� i�c�n� tl�� �ra�a��, th�ra:t� inc:re�s�s bc�un in 2�?{�� �rc: d�si�?ned tc� r�turn the <br /> s�-st�:cn t€� �uppartin� it��;lt. "���x i-nay° alsc� a��tic�that t��r��es c�Zar�c:,d ar� c���i��xec�tc� <br /> ��1tir�iat�I���iring in s1i�;htl�m�z� rt�c�n��� th�n is�aeeciec� c�n� ��e�rt}r h��i�tc� c�pera��th� <br /> ��'st�:��t�_ �`his c���era�� ��°�IE h� �lac�d intc� a capzta� re�erv� acc�ur�� ar��i us�:d ta�ay fc�r th�: <br /> ��er�3 co�t�y p�z�p �tati�n rez�cs��atinns t�i�t ar��x�Z�:cte�!to c�ccu�r�;v�;ry tcn tc� �1't��n }`��rs <br /> alc���� v+Fith cat��r�t-�ajr�r repairs th�t arc n��c�e:d fram tir��e ta finrme and ar� r�c�t anticipat�;c�. <br /> Fi���llv, as nc�tec� iz� th� study c�c�ne k���ur f inai�ci�1 c�-�nsul:tatzt, �he incc�rz�e; ea�ectec� tc� b� <br /> ��n�;r�teci bv r�isrr�� tl�� rates i�; �a�er� c�n the �n�r�u��t c�#'ti�ater p�apl�;ha.�re ���ec� il� the <br /> pa��. C)��er i�ie �rst��ear taf t��e r�te incr���e. ���at�:r ccansumptic��� h�.s dre�}���c� ��° 1 Q-1�i�o <br /> an�� z��a�° c�ntinu� ta c�rc�� as rat�s incr�ase:. �I"hi�chang;� ir� u������tt�rn m�y3 reqz�irc th� <br /> C'c�ur�ti�:�tc� �a�r��iif�' t�ie appr���-cd ratcs �n nrc�cr ta �nair�tain ih� incc�n�e t�ec����r�� fvr saf�. <br /> �t�c! �tfi�ient c��ac:r�ti€�n c�t'tl�c� s}���t�,z��, <br />