The numbers are to show which beat in the measure the chord change falls on.

Capo 1st fret 
      
Intro:     1--2--3--4--|--1--2--3--4--| 
           C (x32010@1)      C/D (x5555x@1) Am7 (x02010@1)    C/D (x5555x@1)
          
          (Repeat)

Verse:     1--2--3--4--|--1--2--3--4--|   (4 times)
           C (x32010@1)      C/D (x5555x@1) Am7 (x02010@1)    C/D (x5555x@1)1--2--3--4--|--1--2--3--4--| 
           F2 (135211@1)           G (320003@1)Chorus:    1--2--3--4--|--1--2--3--4--|   
           C (x32010@1)            G (320003@1)1--2--3--4--|--1--2--3--4--|   
           Bb (x1333x@1)           F2 (135211@1)(Repeat)

Repeat Verse

Repeat Chorus

Interlude: 1--2--3--4--|--1--2--3--4--|   
           C (x32010@1)            G (320003@1)1--2--3--4--|--1--2--3--4--|   
           Bb (x1333x@1)           F2 (135211@1)Repeat Chorus

Outro:     1--2--3--4--|--1--2--3--4--|  (3 Times) 
           C (x32010@1)      C/D (x5555x@1) Am7 (x02010@1)    C/D (x5555x@1)1--2--3--4--|--1--2--3--4--| 
           C (x32010@1)      C/D (x5555x@1) Am7(Sustain)