Full Time Equivalent (FTE) forces / casualties = % of troops
as abridged from the sourced link
1980..... 2,159,630 / 2,392 = .11%
1985..... 2,323,185 / 2,252 = .10%
1990..... 2,258,324 / 1,507 = .07%
1995..... 1,661,928 / 1,040 = .06%
2000..... 1,530,430 / .. 758 = .05%
2005..... 1,664,014 / 1,942 = .12%