Compared to 10 years ago, fewer Americans are confident in the current US vaccination system, according to a survey from the American Society of Microbiology.

Overall, 77% of respondents were confident in the current system in the US for evaluating the safety of vaccines and recommendations for when they should be given. That’s down 8 percentage points from 2008, according to a survey of about 1,000 adults.

In addition, 67% said they were confident that the current system ensures an adequate supply of necessary vaccines to prevent shortages, a drop of 11 percentage points from 2008. And 59% “strongly” believed they had personally benefitted from vaccine development over the past half-century, a 16 percentage-point drop from 2008.