Twenty-six percent of employers said they are hiring workers with H-1B visas this year, according to a new CareerBuilder survey. And 13% of all employers said they tried to hire workers with H-1B visas this year, but were denied, in part, due to the volume of companies applying for them. Others said they didn’t apply in time or didn’t meet requirements.

Among occupations for which employers are recruiting workers with H-1B visas this year are:

• Software engineers: 19%
• Systems analysts and programmers: 11%
• Database administrators: 9%
• Network administrators: 9%
• Sales and distribution managers: 9%
• Financial analysts: 9%
• Electrical and electronic engineers: 8%
• Mechanical engineers: 8%

The survey also found extended vacancies are causing extensive problems, with 36% of employers surveyed currently have positions that stay open for 12 weeks or longer. On average, these companies reported losing about $14,000 for every job that stays vacant for this length of time; about one in six loses $25,000 or more.

Among the challenges employers have faced due to extended job vacancies are:

• Loss of revenue: 34%
• Lower quality of work due to employees being overworked: 36%
• Declines in customer service: 35%
• Work simply not getting done: 48%

The survey was conducted online by Harris Interactive on behalf of CareerBuilder among 2,321 hiring managers and human resource professionals. The survey was conducted between May 14 and June 3, 2015.