| Value | Category | 
                                    
                    
                        | 1970 |  | 
                                    
                    
                        | 2007 |  | 
                                    
                    
                        | 2011 |  | 
                                    
                    
                        | ASGJE |  | 
                                    
                    
                        | BATANIJE |  | 
                                    
                    
                        | GAZ NATYROR NGA PUSI |  | 
                                    
                    
                        | NGROHJE ME PELET |  | 
                                    
                    
                        | NUK KA |  | 
                                    
                    
                        | NUK SIGUROHET DOT |  | 
                                    
                    
                        | SKA |  | 
                                    
                    
                        | Sysmiss |  | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.