To calculate the percent change from 100 to 29, you can use the formula:
\[ \text{Percent Change} = \left( \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \right) \times 100 \]
In this case, the old value is 100 and the new value is 29. Plugging in the values, we get:
\[ \text{Percent Change} = \left( \frac{29 - 100}{100} \right) \times 100 \]
\[ \text{Percent Change} = \left( \frac{-71}{100} \right) \times 100 \]
\[ \text{Percent Change} = -71% \]
So, the percent change from 100 to 29 is -71%, indicating a decrease.