The EEOC just released statistics on claims filed/settled in 2014. The percentage of charges alleging retaliation reached its highest amount ever: 42.8%. Also of note, on a national basis, the second most common charge filed was for race discrimination (including harassment), followed by sex discrimination (including pregnancy and sexual harassment). In Oregon, 210 charges were filed in 2014. Retaliation charges also lead in Oregon. However, in contrast to national statistics, more charges were filed based on sex discrimination in Oregon in 2014, than on race discrimination.
Oregon data is here: http://www1.eeoc.gov/eeoc/statistics/enforcement/charges_by_state.cfm#centercol
National data is here: http://www1.eeoc.gov/eeoc/statistics/enforcement/state_14.cfm