nacion  porc.inmuniz   tasa.mort 
           "Bolivia"        77       118
            "Brazil"        69        65
          "Cambodia"        32       184
            "Canada"        85         8
             "China"        94        43
    "Czech_Republic"        99        12
             "Egypt"        89        55
          "Ethiopia"        13       208
           "Finland"        95         7
            "France"        95         9
            "Greece"        54         9
             "India"        89       124
             "Italy"        95        10
             "Japan"        87         6
            "Mexico"        91        33
            "Poland"        98        16
"Russian_Federation"        73        32
           "Senegal"        47       145
            "Turkey"        76        87
    "United_Kingdom"        90         9