What is the per capita growth rate of pronghorns in Alberta between 1924 and 1996?

Pronghorns look very similar to antelopes and are considered the fastest mammal in North America. They can be found in the Southeastern parts of Alberta. 



In the 1800s, it is thought that the population of pronghorns reach 35 million in the Prairies. By 1924, only 22,000 pronghorns could be found in Alberta. In 1996, only 10,999 remained.



What is the per capita growth rate of pronghorns in Alberta between 1924 and 1996?



Express your answer as a value between 0 and 1 rounded to two decimal places. If the population is decreasing indicate this with a negative sign.