Expectations in 2012 (ie expectations of 2013) were almost the most pessimistic ever, trailing only 1973. Expectations in 2017 (ie expectations of 2018) were more optimistic, but still evenly split (49% to 49%). As far as you can tell given the missing years, we seem to be in the most sustained low since the data began. I was surprised to see that expectations bounced back strongly in the late 1970s--in 1979, 58% expected American influence to grow in 1980, only 30% to decline.
[Data from the Roper Center for Public Opinion Research]