| Value | Category | 
                                    
                    
                        | 1 | We would not be able to survive without it | 
                                    
                    
                        | 2 | Important, but we would survive without it | 
                                    
                    
                        | 3 | Not important | 
                                    
                    
                        | 9 | No answer | 
                            
            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.