20.125


                                    16.152


                                     8.773


                                     2.531



                                     1974


                                    14.453


                                    20.379


                                    14.244


                                     8.694


                                     2.354



                                     1975


                                    15.782


                                    21.561


                                    15.118


                                     9.647


                                     2.695



                                     1976


                                    15.446


                                    20.889


                                    15.085


                                     9.278


                                     2.613



                                     1977


                                    17.325


                                    23.050


                                    17.238


                                    10.311


                                     2.945



                                     1978


                                    18.305


                                    19.134


                                    17.761