| 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            4 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           | 
              
          
                  | 
            Using and analyzing images: Public transportation           | 
                  
            percent           | 
                  
            100           | 
                  
            3 years ago           |