Some patients, approximately 5-10% per annum, will fail to respond having previously done so - the so-called secondary failures.
The mean growth rate is estimated to be 0.008 per quarter (or, 3.2 percent per annum).
A ceiling of 7500 per annum was imposed on the issue of vouchers in 1965.
The overall increase in world population (currently 1.7% per annum) is partly to blame, especially in the third world.
This would imply a rate of deforestation of the order of 0.7 per cent per annum.
Current capacity is what the firm could produce per annum.
Short-term internal rates are likely therefore to be 5 to 6 per cent per annum and long-term rates about 6 per cent.
These saved time by simultaneously testing varieties on farmers' fields and on the research station thus increasing the effective genetic gain per annum.
