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Refer the data frame screenshot df10

I have tried all options / solutions available to sort the pivot by year colum '2019'. However I am getting the following error.

KeyError: '2019'

Few lines above this error says :

*1690             values = self.axes[axis].get_level_values(key)._values
1691         else:
-> 1692             raise KeyError(key)
1693 
1694         # Check for duplicates*

I am using the following code

df10 = df10.sort_values('2019' , ascending=False)

I thought there is whitespace in the column so used below code as well and got the error

df10.columns=df10.columns.str.strip()

Can only use .str accessor with string values!

Here is the output of

print (df10.columns.tolist())
[2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019]
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