Following are the number of Paso's imported into Australia. The source is a document produced by the Ducati Owners Club of NSW in 1991. (This covers ALL Ducatis brought into Australia between 1964 and 1990, it has not been updated since)
750 PASO
1987 45
1988 42
1989 36
1990 25
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148
906 PASO
1988 45
1989 102 ( 3 grey)
1990 63
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210
907IE
1990 24
I cannot confirm how accurate these numbers are but I assume they would be reasnably OK. Hope these are some help.
Count me in on the OZ connection, I am in Newcastle with a grey 89 906.