use weighted avearge to forecast the next year YEAR $20062007200820092010$

JAN $7427418969511030$

FEB $6977007938611032$

MAR $7767748859381126$

APR $898932105511091285$

MAY $10301099120412741468$

JUN $11071223132614221637$

JUL $11651290130314861611$

AUG $12161349143615551608$

SEP $12081341147316041528$

OCT $11311296145316001420$

NOV $9711066117014031119$

DEC $783901102312091013$