Pandas Value Counts

import pandas as pd

Create an Example Dataframe

data = {
    'name': ['Jason', 'Molly', 'Tina', 'Jake', 'Amy'], 
    'year': [2012, 2012, 2013, 2014, 2014], 
    'reports': [4, 24, 31, 2, 3]
    }
df = pd.DataFrame(data, index = ['Cochice', 'Pima', 'Santa Cruz', 'Maricopa', 'Yuma'])
df

	name	year	reports
Cochice	Jason	2012	4
Pima	Molly	2012	24
Santa Cruz	Tina	2013	31
Maricopa	Jake	2014	2
Yuma	Amy	2014	3

Value Counts

df.year.value_counts()

2014    2
2012    2
2013    1
Name: year, dtype: int64