user: Question: Which year earlier than 2006 has the average Total Convictions of Fraud at 1521?
Columns: ['Year', 'Total Convictions', 'Homicide (Art. 111,112,113,116 StGB)', 'Serious Bodily Injury (Art. 122 StGB)', 'Minor Bodily Injury (Art. 123 StGB)', 'Sexual Contact with Children (Art. 187 StGB)', 'Rape (Art. 190 StGB)', 'Theft (Art. 139 StGB)', 'Robbery (Art. 140 StGB)', 'Receiving Stolen Goods (Art. 160 StGB)', 'Embezzlement (Art. 138 StGB)', 'Fraud (Art. 146 StGB)', 'Narcotics Possession', 'Major Violation of Traffic Laws (Art. 90 SVG)', 'Drunk Driving (Art. 91 Abs. 1 Satz 2 SVG)']
Types: ['real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [2005.0, 85605.0, 93.0, 94.0, 2459.0, 413.0, 109.0, 6557.0, 489.0, 1262.0, 910.0, 1484.0, 2846.0, 22163.0, 15776.0]
SQL:

assistant: SELECT "Total Convictions" FROM "Table" WHERE "Fraud (Art. 146 StGB)" = 1521.0 AND "Year" < 2006.0;