X-axis error

Hi,
I'm trying to draw a XYplot with the data of 174 months.
When I use (line 142)
       year = ispan(1,174,1)
       do n=0,neof-1
           rts@gsnLeftString = "EOF "+(n+1)
           rts@gsnRightString = sprintf("%5.1f", eof@pcvar(n)) +"%"
           plot(n) = gsn_csm_xy (wks,year,eof_tsstd(n,:),rts)
       end do
       gsn_panel(wks,plot,(/neof,1/),rtsP)
       plot(n) = gsn_csm_xy (wks,year,eof_tsstd(n,:),rts)
it can draw the correct picture.

but when I use( line 138)
      eof_time = eof_tsstd&time
      yyyymm = ut_calendar(eof_time,-2)/100
      year = yyyymm/100
      printVarSummary(year)
      do n=0,neof-1
          rts@gsnLeftString = "EOF "+(n+1)
          rts@gsnRightString = sprintf("%5.1f", eof@pcvar(n)) +"%"
          plot(n) = gsn_csm_xy (wks,year,eof_tsstd(n,:),rts)
      end do
      gsn_panel(wks,plot,(/neof,1/),rtsP)
it cannot draw the correct one but there's no error message.

PrintVarSummary(eof_tsstd):
Variable: eof_tsstd
Type: float
Total Size: 696 bytes
            174 values
Dimensions and sizes: [evn | 1] x [time | 174]
Coordinates:
            evn: [1..1]
            time: [17341704..17468112]
Number Of Attributes: 5
  ts_mean : 3.105695
  matrix : covariance
  _FillValue : -9.96921e+36
  long_name : EOF: Amplitude: Wgt: Sea Level Pressure
  standardize_op_ncl : dim_standardize over dimension: time

PrintVarSummary(year):
Variable: year
Type: integer
Total Size: 696 bytes
            174 values
Number of Dimensions: 1
Dimensions and sizes: [174]
Coordinates:

My script is attached.
Could you plese help fix it?Thanks a lot!
Nee

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