I have dataframe consist of 2 columns. UCC and year. I want to count each UCC how much time it is repeated and give the o/p is in next column. Data: UCC year 23. 2018 23. 2019 23. 2020 23. 2021 23. 2022 24. 2021 24. 2015 25. 2011 27. 2018 27. 2019 I want output in the format UCC year countif 23. 2018. 5 23. 2019. 4 23. 2020. 3 .....
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