print for map{ 
    m[(^\d+\s+(?:[\d\.]+\s+){3})(.+$)]
} <DATA>;
## Outputs stuff like

0    622.7    319.1    303.6
50    530.6    265.9    264.6
1    618.0    316.8    301.2
51    548.1    274.9    273.2
...
42    530.6    267.3    263.2
Under 16    10,490.0    5,380.2    5,109.7
44    569.0    286.1    282.9
Under 18    12,130.5    6,223.6    5,906.9
46    558.8    281.7    277.0
45-64/59*    9,614.5    5,450.5    4,164.0
48    542.6    273.2    269.5
65/60**    8,993.0    2,947.2    6,045.7
49    526.8    264.7    262.2
and over