Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Gross Domestic Product | US Dollar Exchange | Inflation Index\n(2000=100) | Per Capita Income\n(as % of USA) |
| --- | --- | --- | --- | --- |
| 1980 | 7,764 | 0.27 Kuwaiti Dinars | 55 | 171.08 |
| 1985 | 6,450 | 0.29 Kuwaiti Dinars | 68 | 71.58 |
| 1990 | 5,328 | 0.29 Kuwaiti Dinars | 80 | 37.00 |
| 1995 | 8,114 | 0.29 Kuwaiti Dinars | 92 | 62.14 |
| 2000 | 11,570 | 0.30 Kuwaiti Dinars | 100 | 48.92 |
| 2005 | 21,783 | 0.29 Kuwaiti Dinars | 108 | 64.35 |
Question:
which year has the most per capita income (as % of usa)?
Answer:
1980