如何在数据框中添加一列，其中相同索引的值是重复的
数据框：
Electricity and heat [1,0,0]
Electricity and heat [0,1,0]
Electricity and heat [0,1,1]
Electricity and heat [1,0,1]
Industry [1,0,0]
Industry [0,1,0]
Industry [1,0,1]
Energy [1,0,0]
Energy [1,1,1]
Agriculture [1,0,0]
Industrial Processes [1,0,0]
Other Fuel Combustion [1,0,0]
我要添加的列：
Electricity and heat 13
Industry 8
Energy 5
Agriculture 4
Industrial Processes 4
Other Fuel Combustion 4
我想要的样子：
Electricity and heat [1,0,0] 13
Electricity and heat [0,1,0] 13
Electricity and heat [0,1,1] 13
Electricity and heat [1,0,1] 13
Industry [1,0,0] 8
Industry [0,1,0] 8
Industry [1,0,1] 8
Energy [1,0,0] 5
Energy [1,1,1] 5
Agriculture [1,0,0] 4
Industrial Processes [1,0,0] 4
Other Fuel Combustion [1,0,0] 4