How to convert units from percent per year to real number with CountryData? [closed]

I have CountryData coming in via e.g.

Entity["Country", "Australia"][  EntityProperty["Country", "GDP",   {"CurrencyUnit" -> "Constant2000USDollar", "TimeSeriesOperator" -> "AnnualGrowthRate"}  ]]

Which returns

-0.00383656% per year (* unit: percent per year *)

My desired output is -0.0000383656 (i.e. as purely a decimal number).

I am surprised by how hard it has been to find an answer. Despite this question being very simple, I can't find a way with Quantity, NumberForm, etc.