"T1"  "T2"    "End"  "When"  "Final"  "Last"
1951  1955      819    140     1170     739
1956  1960      751    140     1350     717
1961  1965      901    187     1510     595
1966  1970     1270    202     2040     741
1971  1975     1280    290     2040     619
1976  1980     1830    405     2430     592
1981  1985     2620    549     2890     506
1986  1990     7830   1970     5570     697
1991  1995    15200   3300     7080     813
1996  2000    42100   5570     8690     683
2001  2005   146000  10900    16600    1160
2006  2009   191000  10500    12400     580