Assertion: bullock's contribution | /r/HasProperty | 71 per cent
Facets:
value: in 1961
type: TEMPORAL
Source sentences:
text: In 1961 the contribution of the draught animals to the total energy requirements of the farming system was 71 per cent, by 1991 this was come down to 23.3 per cent almost all operations other than land preparation switched over to electrical and mechanical source of power, even ploughing of land was progressively brought under mechanization.