Place number with awk

Hello,
if I've a list of number

23
34
56
78

how I can place a sequence of ordinated number in a boundary column so

1 23
2 34
3 56
4 78

Thanks in advance!

awk '{print FNR, $0}' myFile

great!

# nl file
     1  23
     2  34
     3  56
     4  78