🐛 fixing a bug in annual global temperature anomalies

[veronikasamborska1994]

previously stupidly set below/above 0 columns before doing the annual averages

[owidbot]

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Login: ssh owid@staging-site-temp-anomaly-bug

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```diff Legend: +New ~Modified -Removed =Identical Details Hint: Run this locally with etl diff REMOTE data/ --include yourdataset --verbose --snippet ``` Automatically updated datasets matching _weekly_wildfires|excess_mortality|covid|fluid|flunet|country_profile|garden/ihme_gbd/2019/gbd_risk_ are not included

Edited: 2024-07-02 08:43:47 UTC Execution time: 15.40 seconds