In the 12 months ending September, 2016, 61 out of 67 people put on trial for terror-related cases were convicted.
This compares with a tally of 42 convictions in the previous year and amounts to an increase of 45 per cent over 2014-2015.
"There were 67 trials completed by the Crown Prosecution Service Counter Terrorism Division (CPS CTD) in the year ending September 2016. Of these, 61 (91 per cent) led to a conviction," Home Office said in its quarterly assessment.
The figures, however, indicate a drop in the number of arrests under the Terrorism Act 2000, falling by a fifth in the year ending September 2016 compared with the previous year - from 317 to 255 arrests.
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"Although the number of arrests has fallen, it is still relatively high when compared to other recent years," the Home Office said.
It adds: "There were 178 persons in custody for terrorism-related offences and domestic extremism/separatism, up from 170 in the previous year".
The proportion of women and girls arrested has fallen slightly to 11 per cent, representing 29 suspects, but the number of under-18s detained has remained static.
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