IOWA CITY, Iowa — The number of known cases of sexual harassment committed by employees in Iowa’s executive branch spiked last year after responsibility for conducting investigations was shifted to a central agency.The increase may be welcome news for advocates for sexual harassment victims, who had expressed disappointment at the state’s handling of the issue in the past.Department of Administrative Services spokeswoman Tami Wiencek said the agency concluded there were 10 founded complaints of sexual harassment in the last fiscal year that ended June 30.