Indicator in April fell by 0.10 points to 1.58 the previous month, although it was still significantly above its long-term average 1,5.
Low interest rates, a growing job market and low import prices due to the entrenched the Swiss franc were the main engines of growth in domestic consumption, said a UBS.
The largest Swiss bank still are optimistic about the economy as a whole. Bank economists expect the inflation-adjusted consumer spending this year will grow by 1,6%.