[31] The schedule showing his employment history before 2 December 1989 covers the period 1 July 1986 to 2 December 1989 and reveals that in that approximately three and a half years his earnings were about $20,000 after the deduction of income tax. The schedule shows that in the year which ended on 30 June 1987 he was employed by Budget Demolitions as a yardman and salesman for fifty-two weeks and by the Eagle Farm College of Technical and Further Education as an engineer's labourer for nearly four and a half weeks, but that his after-tax income from those jobs is unknown. (It appears that for nearly four and a half weeks he had two jobs.) Among his taxation records there is, however, an Australian Taxation Office refund notice issued on 30 September 1987 showing that his taxable income for the year ended 30 June 1987 was nil and that he was entitled to a refund of $354.62. For the year ended 30 June 1988 the schedule shows his after-tax income as $14,299.42: $2,666.95 earned as a yardman and salesman for Budget Demolitions, $1,100 as a casual gardener for the Cottage Car Co. Pty Ltd, $8,817.12 earned as a labourer for Eddie Wright, house remover, and another $1,715.35 earned as a gardener and driver for the Cottage Car Co. Pty Ltd. Among the other documents in exhibit 2 is, however, an Australian Taxation Office refund notice issued on 5 September 1988 showing the plaintiff's taxable income for the year ended 30 June 1988 at $4,389, and that he was entitled to a refund of $441.27. Other documents show that he received $1,766.81, from which tax instalments of $30.37 were deducted, from the Department of Social Security for the period 25 November 1987 to 15 March 1988, and $773.60 from that department for the period 17 May 1988 to 28 June 1988. The schedule shows that for the year ended 30 June 1989 the plaintiff's after-tax earnings were $516.44 as a labourer for Eddie Wright, and other documents show that he received $1,932.56 from the Department of Social Security for the period