The bar chart compares the number of prisoners in five coutries, namely Great Britain, Australia, the US, New Zealand and Canada in fifty years period starting from 1930.
Overall, although there was some changes in the amount of prisoners in five countries, the highest number of prisoners was recorded for the US over the period in question.
In 1930, Canada had 120 thousand prisoners, which was four times as high as Great Britain, at below 30 thousand. While the figure for Canada gradually decreased each years to merely under 100 thousand in 1980, an opposite pattern can be observed in Great Britain, leading to the gap between Canada and Great Britain had narrowed by the end of period, with more 90 thousand.
Starting at equal number in 1930, the figure for the US and New Zealand experienced opposite trend. Meanwhile the number of prisoners in the US increased significantly to 140 thousand in the final year which was ranked the first in over the period, New Zealand decreased steadily to under 60 thousand in 1950, after which it rose to 90 thousand in the last year. The amount of Australia was under 70 thousand in 1930, which was fluctuated considerably and then dropped to around 50 thousand in 1980. 
The bar chart compares the  
number
 of  
prisoners
 in five  
coutries
,  
namely
  Great
 Britain, Australia, the US, New Zealand and Canada in fifty years  
period
 starting from 1930. 
Overall
, although there was  
some
  changes
 in the amount of  
prisoners
 in five countries, the highest  
number
 of  
prisoners
  was recorded
 for the US over the  
period
 in question.
In 1930, Canada had 120 thousand  
prisoners
, which was four times as high as  
Great
 Britain, at below 30 thousand. While the figure for Canada  
gradually
 decreased each  
years
 to  
merely
 under 100 thousand in 1980, an opposite pattern can  
be observed
 in  
Great
 Britain, leading to the gap between Canada and  
Great
 Britain had narrowed by the  
end
 of  
period
, with more 90 thousand.
Starting at equal  
number
 in 1930, the figure for the US and New Zealand experienced opposite trend.  
Meanwhile
 the  
number
 of  
prisoners
 in the US increased  
significantly
 to 140 thousand in the final  
year
 which  
was ranked
 the  
first
 in over the  
period
, New Zealand decreased  
steadily
 to under 60 thousand in 1950, after which it rose to 90 thousand in the last  
year
. The amount of Australia was under 70 thousand in 1930, which  
was fluctuated
  considerably
 and then dropped to around 50 thousand in 1980.