Error Funcion Pronostico

Estoy tratando de pronosticar a 12 meses (para a#o 2009) con base a unos valores historicos (a#o 2008) con los que ya cuento
sin embargo al tratar de realizar la operacion me sale N/A, podrian decirme la forma correcta de unsar la formula?
A B
1 mes valor
2 1 133890 =PRONOSTICO(12,C3:C14,B3:B14)
3 2 135000 =PRONOSTICO(12,C4:C15,B4:B15)
4 3 135790 =PRONOSTICO(12,C5:C16,B5:B16)
5 4 137300 =PRONOSTICO(12,C6:C17,B6:B17)
6 5 138130 =PRONOSTICO(12,C7:C18,B7:B18)
7 6 139100 =PRONOSTICO(12,C8:C19,B8:B19)
8 7 139900 =PRONOSTICO(12,C9:C20,B9:B20)
9 8 141120 =PRONOSTICO(12,C10:C21,B10:B21)
10 9 141890 =PRONOSTICO(12,C11:C22,B11:B22)
11 10 143230 =PRONOSTICO(12,C12:C23,B12:B23)
12 11 144000 =PRONOSTICO(12,C13:C24,B13:B24)
133 12 145290 =PRONOSTICO(12,C14:C25,B14:B25)