Not able to retrieve chain data for 2020

I am retrieving Corn chain, Naturalgas chain from below api via SOAP - http://www.reuters.com/ns/2006/05/01/webservices/rkd/Common_1

I am getting output in below format
[0#1C:] => Array

        (
            [1CN9] => 3.88
            [1CU9] => 3.9675
            [1CZ9] => 4.06
            [1CH0] => 4.165
            [1CK0] => 4.21
            [1CN0] => 4.25
            [1CU0] => 4.105
            [1CZ0] => 4.1225
            [1CH1] => 4.21
            [1CK1] => 4.26
            [1CN1] => 4.3025
            [1CU1] => 4.16
            [1CZ1] => 4.17
            [1CN2] => 4.3275
            [1CZ2] => 4.21
        )

Here [0#1C:] Corn chains future symbol
[1CN9] - 1CN represents for May month and 9 represents the difference in year from 2010. Current year 2019 so 2019-2010 so 9 Hence for 2020 we need to have data like 1CN10 but it is not present.

URL - http://www.reuters.com/ns/2006/05/01/webservices/rkd/Quotes_1/RetrieveItem_3