data_all = ['2017_unit1_pb1_history.csv',
            '2016_unit1_pb1_history.csv',  '2017_unit1_pb2_history.csv',
            '2016_unit1_pb2_history.csv',  '2017_unit1_pb3_history.csv',
            '2016_unit1_pb3_history.csv',  '2017_unit2_pb1_history.csv',
            '2016_unit2_pb1_history.csv',  '2017_unit2_pb2_history.csv',
            '2016_unit2_pb2_history.csv',  '2017_unit2_pb3_history.csv',
            '2016_unit2_pb3_history.csv',  '2017_unit3_pb1_history.csv',
            '2016_unit3_pb1_history.csv',  '2017_unit3_pb2_history.csv',
            '2016_unit3_pb2_history.csv',  '2017_unit3_pb3_history.csv',
            '2016_unit3_pb3_history.csv',  '2017_unit3_pb4_history.csv',
            '2016_unit3_pb4_history.csv',  '2017_unit4_pb1_history.csv',
            '2016_unit4_pb1_history.csv',  '2017_unit4_pb2_history.csv',
            '2016_unit4_pb2_history.csv',  '2017_unit4_pb3_history.csv',
            '2016_unit4_pb3_history.csv',  '2017_unit4_pb4_history.csv',
            '2016_unit4_pb4_history.csv',  '2017_unit4_pb5_history.csv',
            '2016_unit4_pb5_history.csv',  '2017_unit4_pb6_history.csv',
            '2016_unit4_pb6_history.csv',  '2017_unit4_pb7_history.csv',
            '2016_unit4_pb7_history.csv',  '2017_unit5_pb1_history.csv',
            '2016_unit5_pb1_history.csv',  '2017_unit5_pb2_history.csv',
            '2016_unit5_pb2_history.csv',  '2017_unit5_pb3_history.csv',
            '2016_unit5_pb3_history.csv',  '2017_unit5_pb4_history.csv',
            '2016_unit5_pb4_history.csv']

data_2016 = ['2016_unit1_pb1_history.csv', 
            '2016_unit1_pb2_history.csv',  
            '2016_unit1_pb3_history.csv', 
            '2016_unit2_pb1_history.csv',  
            '2016_unit2_pb2_history.csv', 
            '2016_unit2_pb3_history.csv',  
            '2016_unit3_pb1_history.csv',  
            '2016_unit3_pb2_history.csv',
            '2016_unit3_pb3_history.csv',  
            '2016_unit3_pb4_history.csv',  
            '2016_unit4_pb1_history.csv',  
            '2016_unit4_pb2_history.csv',  
            '2016_unit4_pb3_history.csv', 
            '2016_unit4_pb4_history.csv',  
            '2016_unit4_pb5_history.csv',
            '2016_unit4_pb6_history.csv',  
            '2016_unit4_pb7_history.csv',  
            '2016_unit5_pb1_history.csv', 
            '2016_unit5_pb2_history.csv', 
            '2016_unit5_pb3_history.csv', 
            '2016_unit5_pb4_history.csv']

data_2017 = ['2017_unit1_pb1_history.csv',
             '2017_unit1_pb2_history.csv', 
             '2017_unit1_pb3_history.csv',
             '2017_unit2_pb1_history.csv',  
             '2017_unit2_pb2_history.csv',
             '2017_unit2_pb3_history.csv', 
             '2017_unit3_pb1_history.csv',
             '2017_unit3_pb2_history.csv',  
             '2017_unit3_pb3_history.csv',
             '2017_unit3_pb4_history.csv', 
             '2017_unit4_pb1_history.csv',
             '2017_unit4_pb2_history.csv', 
             '2017_unit4_pb3_history.csv',  
             '2017_unit4_pb4_history.csv', 
             '2017_unit4_pb5_history.csv',  
             '2017_unit4_pb6_history.csv',  
             '2017_unit4_pb7_history.csv',  
             '2017_unit5_pb1_history.csv',  
             '2017_unit5_pb2_history.csv',  
             '2017_unit5_pb3_history.csv', 
             '2017_unit5_pb4_history.csv']
          
data_years = ['2016', '2017']

data_agg =  ['_unit1_pb1_history.csv',
             '_unit1_pb2_history.csv', 
             '_unit1_pb3_history.csv',
             '_unit2_pb1_history.csv',  
             '_unit2_pb2_history.csv',
             '_unit2_pb3_history.csv', 
             '_unit3_pb1_history.csv',
             '_unit3_pb2_history.csv',  
             '_unit3_pb3_history.csv',
             '_unit3_pb4_history.csv', 
             '_unit4_pb1_history.csv',
             '_unit4_pb2_history.csv', 
             '_unit4_pb3_history.csv',  
             '_unit4_pb4_history.csv', 
             '_unit4_pb5_history.csv',  
             '_unit4_pb6_history.csv',  
             '_unit4_pb7_history.csv',  
             '_unit5_pb1_history.csv',  
             '_unit5_pb2_history.csv',  
             '_unit5_pb3_history.csv', 
             '_unit5_pb4_history.csv']