Robotframework - returned value of Evaluate keyword does not store all numeric values in variable

I'm trying to compute for a value using Evaluate keyword and it seems not storing the exact whole numeric numbers in the variable ${C1} but it seems to return the exact values I want as per log file.

Here's my sample code.

${C1}    Evaluate    1.025**${C_IP_Years_Between}

Here's the log:

${C1} = BuiltIn . Evaluate 1.025**${C_IP_Years_Between}
Documentation:  
Evaluates the given expression in Python and returns the results.

Start / End / Elapsed:  20180413 21:09:18.343 / 20180413 21:09:18.377 / 00:00:00.034
21:09:18.345    TRACE   Arguments: [ '1.025**11' ]  
21:09:18.376    TRACE   Return: 1.3120866578012655  
21:09:18.377    INFO    ${C1} = 1.3120866578

How can I be able to use the whole values being returned above (e.g. 1.3120866578012655)