问一个程序的编译问题

[local]1[/local]
assume cs:codesg,ds:data,es:table
data segment
db '1975','1976','1977','1978','1979','1980','1981','1982','1983'
db '1984','1985','1986','1987','1988','1989','1990','1991','1992'
db '1993','1994','1995'

dd 16,22,382,1356,2390,8000,16000,24486,50065,97479,140417,197514
dd 345980,590827,803530,1183000,1843000,2759000,3753000,4649000,5937000

dw 3,7,9,13,28,38,130,220,476,778,1001,1442,2258,2793,4037,5635,8226
dw 11542,14430,15257,17800
data ends
table segment
db 21 dup ('year summ ne ?? ')
table ends
code segment
start:mov ax,data
      mov ds,ax
      mov ax,table
      mov es,ax
      mov bx,0
      mov si,0
      mov di,0
      mov cx,21
     
      s:
      mov al,[bx]
      mov es:[di],al
      mov al,[bx+1]
      mov es:[di+1],al
      mov al,[bx+2]
      mov es:[di+2],al
      mov al,[bx+3]
      mov es:[di+3],al
     
      mov ax,54h[bx]
      mov dx,56h[bx]
     
      mov es:5h[di],ax
      mov es:7h[di],ax
     
      mov ax,0a8h[si]
      mov es:0ah[di],ax
     
      mov ax,54h[bx]
      div word ptr ds:0a8h[si]
      mov es:0dh[di],ax
     
      add bx,4
      add si,2
      add di,16
     
      loop s
mov ax,4c00h
int 21h
codesg ends
end start